Author Topic: Decal Bubbles  (Read 1685 times)

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Offline grumpy56

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Decal Bubbles
« on: May 30, 2025, 01:51:35 PM »
Repainted and clear coated my black side covers (76 400/4). Waited 5 days and applied the 400 FOUR decals I got from David Silver Spares. That was on Monday. No problems until today. Getting bubbles in the decals. Hard to see in the pics, but a pretty big one is at the top of the "U". I used soapy water to install them and thought I had removed all the bubbles with a plastic scraper. Those decals are impossible to remove without damaging the finish. Any suggestions before I have to go that route? Pin pricks, bake in the sun??? Thanks.

Online jlh3rd

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Re: Decal Bubbles
« Reply #1 on: May 30, 2025, 02:12:37 PM »
I'd try the pin trick first.

Offline Mikey G.

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Re: Decal Bubbles
« Reply #2 on: May 30, 2025, 02:19:04 PM »
Pin pricks are the "correct" (did a bit of work at a sign shop) solution to this.  Start with a needle, move on to an xacto knife if you need to.  Then work the air out of the bubble, towards the hole.  You shouldn't NEED heat, but a touch of a heat gun is never a bad idea.
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Offline PeWe

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Re: Decal Bubbles
« Reply #3 on: May 30, 2025, 09:11:29 PM »
I should try a plastic bag filled with warm water to lay on the decal where the bubble is, pick it with a needle without harm the paint.

Easy to make a mistake with a heat gun.
« Last Edit: May 30, 2025, 09:18:03 PM by PeWe »
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline pjlogue

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Re: Decal Bubbles
« Reply #4 on: May 31, 2025, 05:38:18 AM »
Paint outgassing takes a while (weeks) and is dependent on thickness of the paint applied and the chemical makeup of the paint and temperature when outgassing.  When I repainted the false tank and side covers of my GL1000 I waited a month before applying the decals.  I probably could have applied the decals sooner, but I didn't want to take any chances.  I realize this info is after the fact but someone else may benefit from it.

-P.

Offline grumpy56

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Re: Decal Bubbles
« Reply #5 on: May 31, 2025, 06:05:16 AM »
Appreciate the replies. Will definately wait longer next time. Will let you know how it turns out.

Offline pjandrew99

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Re: Decal Bubbles
« Reply #6 on: May 31, 2025, 08:18:36 AM »
Paint outgassing takes a while (weeks) and is dependent on thickness of the paint applied and the chemical makeup of the paint and temperature when outgassing.  When I repainted the false tank and side covers of my GL1000 I waited a month before applying the decals.  I probably could have applied the decals sooner, but I didn't want to take any chances.  I realize this info is after the fact but someone else may benefit from it.

-P.
Answers the question I had in my head this morning about duration after reading the OP. Thanks
I'm guessing that most are putting the decal over 2K clear coat and then reapplying the 2K clear coat over the decal. How come the reapplication doesn't bubble up the decal?
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Offline pjlogue

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Re: Decal Bubbles
« Reply #7 on: May 31, 2025, 08:20:10 AM »
If you use the pin prick or x-acto knife point, you need to re-hydrate the decal on the underside.  A syringe (insulin) and let the decal hydrate a bit then gently press it down with a paper towel to get rid of the excess water.  Gently work any air/water out from under the decal through the hole you made. 

-P.

Offline pjlogue

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Re: Decal Bubbles
« Reply #8 on: May 31, 2025, 08:23:10 AM »
Paint outgassing takes a while (weeks) and is dependent on thickness of the paint applied and the chemical makeup of the paint and temperature when outgassing.  When I repainted the false tank and side covers of my GL1000 I waited a month before applying the decals.  I probably could have applied the decals sooner, but I didn't want to take any chances.  I realize this info is after the fact but someone else may benefit from it.

-P.
Answers the question I had in my head this morning about duration after reading the OP. Thanks
I'm guessing that most are putting the decal over 2K clear coat and then reapplying the 2K clear coat over the decal. How come the reapplication doesn't bubble up the decal?

If the lower layers of paint/clear coat are thoroughly degasses then there is no gas producing layers below the decal that can get trapped under the decal. 

-P.

Offline pjandrew99

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Re: Decal Bubbles
« Reply #9 on: May 31, 2025, 08:46:04 AM »
Paint outgassing takes a while (weeks) and is dependent on thickness of the paint applied and the chemical makeup of the paint and temperature when outgassing.  When I repainted the false tank and side covers of my GL1000 I waited a month before applying the decals.  I probably could have applied the decals sooner, but I didn't want to take any chances.  I realize this info is after the fact but someone else may benefit from it.

-P.
Answers the question I had in my head this morning about duration after reading the OP. Thanks
I'm guessing that most are putting the decal over 2K clear coat and then reapplying the 2K clear coat over the decal. How come the reapplication doesn't bubble up the decal?

If the lower layers of paint/clear coat are thoroughly degasses then there is no gas producing layers below the decal that can get trapped under the decal. 

-P.
Thanks!
Current Projects

Honda CB750K1
Yamaha SR250
Honda SL350 K0

Offline Ozzybud

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Re: Decal Bubbles
« Reply #10 on: May 31, 2025, 07:34:31 PM »
We're these applied using soapy water or dry?
Applying dry will cause this every time.
1976 Z50A PARAKEET YELLOW
1970 CT70  CANDY SAPPHIRE BLUE
1971 CT70H CANDY TOPAZ ORANGE
1972 CT70H CANDY EMERALD GREEN
1973 CL200 CANDY RIVIERA BLUE
1974 CB350F GLORY BLUE BLACK METALLIC
1973 CB350F FLAKE MATADOR RED
1975 CB360T LIGHT RUBY RED
1975 CB400F VARNISH BLUE
1975 CB550 FLAKE SUNRISE ORANGE
1976 CB750F CANDY ANTARES RED

Offline HondaMan

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Re: Decal Bubbles
« Reply #11 on: May 31, 2025, 08:00:27 PM »
I've noticed (having just painted a bike last week) that the modern iteration of this "candy" paint takes a VERY long time to dry. It's been 8 days and I can still smell some fumes in the garage where the parts are awaiting decals, etc. This seems much longer to me than anything I painted with before 2010 (which was the last previous bike repaint I did).
See SOHC4shop.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book
Link to My CB500/CB550 Book: https://www.lulu.com/search?sortBy=RELEVANCE&page=1&q=my+cb550+book&pageSize=10&adult_audience_rating=00
Link to website: https://sohc4shop.com/  (Note: no longer at www.SOHC4shop.com, moved off WWW. in 2024).

Offline Ozzybud

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Re: Decal Bubbles
« Reply #12 on: May 31, 2025, 09:49:16 PM »
I've noticed (having just painted a bike last week) that the modern iteration of this "candy" paint takes a VERY long time to dry. It's been 8 days and I can still smell some fumes in the garage where the parts are awaiting decals, etc. This seems much longer to me than anything I painted with before 2010 (which was the last previous bike repaint I did).

Was this catalyzed Candy paint? If yes it should be 99.9 percent cured in 24 hours.
I hope you cleared over the candy as most modern candy paints are not UV resistant and will fade right away even under florescent lights.
On the CB350F I just painted Flake Matador Red ,2 coats of clear was immediately applied over the candy. Waited 24 hours then sanded with 800, applied decals then applied
ore.more coat of clear.
« Last Edit: May 31, 2025, 09:51:17 PM by Ozzybud »
1976 Z50A PARAKEET YELLOW
1970 CT70  CANDY SAPPHIRE BLUE
1971 CT70H CANDY TOPAZ ORANGE
1972 CT70H CANDY EMERALD GREEN
1973 CL200 CANDY RIVIERA BLUE
1974 CB350F GLORY BLUE BLACK METALLIC
1973 CB350F FLAKE MATADOR RED
1975 CB360T LIGHT RUBY RED
1975 CB400F VARNISH BLUE
1975 CB550 FLAKE SUNRISE ORANGE
1976 CB750F CANDY ANTARES RED

Offline grumpy56

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Re: Decal Bubbles
« Reply #13 on: June 01, 2025, 08:33:12 PM »
This was just gloss black rattle can with 2 coats of clear. Applied the decals using soapy water. I warmed up the decal a bit and used a pin. Much better now although not perfect. Hopefully they won't continue to bubble any more.

Offline HondaMan

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Re: Decal Bubbles
« Reply #14 on: June 01, 2025, 08:46:37 PM »
I've noticed (having just painted a bike last week) that the modern iteration of this "candy" paint takes a VERY long time to dry. It's been 8 days and I can still smell some fumes in the garage where the parts are awaiting decals, etc. This seems much longer to me than anything I painted with before 2010 (which was the last previous bike repaint I did).

Was this catalyzed Candy paint? If yes it should be 99.9 percent cured in 24 hours.
I hope you cleared over the candy as most modern candy paints are not UV resistant and will fade right away even under florescent lights.
On the CB350F I just painted Flake Matador Red ,2 coats of clear was immediately applied over the candy. Waited 24 hours then sanded with 800, applied decals then applied
ore.more coat of clear.

Yep, it is a catalyzed paint type, something new for me. I ended up forced to wait 4 days after the basecoat because of Colorado's typically unpredictable weather: about 5 minutes into the primer painting, a high wind broke out, flying pollen, leaves and bugs across everywhere. It dropped some cottonwood seeds into the paint right on top of the tank, and the 40+ MPH wind was blowing away the 5 PSI spray from the gun, so I got to wait almost 7 days before the reapplication of the primer [again] after sanding out all the damage. True to form, as I laid the last primer coat and mixed up the first basecoat, another wind cranked up, bringing bugs, seeds and more cottonwood, all 3 which ended up in the basecoat. Then 6 more days later, after sanding out all that, I got the basecoats back on and the 1st of the 2-layer gold (labelled "Basecoat"), all 3 layers of that to get it wet. Then it turned to wind and rain while I was cleaning the gun for the gold topcoat, no more painting. Then, just 9 days later, we got a still, quiet afternoon and I got the 3 top coats and the clearcoats on it. It never took me a month to paint a set of sidecovers and a tank before, and I still have to do the black panels and the decals on the tank. Man, do I miss lacquer...

Looking at my old pictures of my CB500 and other CB550s I worked on in their days, they did not appear to have clearcoat over the black panels: the panels are distinctly less glossy that the candy color on the tanks in the pix. So, I'm doing this one that way: I thought I remembered them looking like that, and the old pix appear to confirm it. The decals also used to chip, leaving the paint undamaged, when zipper-legged leathers (like mine) were dragged across them during chaotic pits stops: my tank bag did that to my 750, too, where the plastic strap clips rested right on the stripes: they were not clear-coated over, either.

I'll study how it looks in the end, compared with those pix.
See SOHC4shop.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book
Link to My CB500/CB550 Book: https://www.lulu.com/search?sortBy=RELEVANCE&page=1&q=my+cb550+book&pageSize=10&adult_audience_rating=00
Link to website: https://sohc4shop.com/  (Note: no longer at www.SOHC4shop.com, moved off WWW. in 2024).

Offline newday777

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Re: Decal Bubbles
« Reply #15 on: June 02, 2025, 02:48:00 AM »
"Colorado's typically unpredictable weather: about 5 minutes into the primer painting, a high wind broke out"

Mark
That reminds me of back in 1984 living in Las Vegas when I went to spray the roof of the full sized school bus (motorhome conversion)white to help reflect the heat, outside of course, I'd get everything taped and masked off and set to spray and the wind would start blowing. I was using regular masking tape and left it taped a couple of days waiting for the wind to stop then tried peeling the paper off that had gotten wet from showers and torn from the wind, the sun baked the tape to the point of having to use thinner to remove the tape, so I had to fully clean up the primer again and re tape 4-5 times before I finally got a wind free day. I think I used an acrylic paint on it, boy was I glad to finally get it done.
Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 1 K2, 4 K6, 1 K8, 1 F1, 1 F3
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline PeWe

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Re: Decal Bubbles
« Reply #16 on: June 02, 2025, 07:12:46 AM »
A dusty big moth that becomes dizzy by the fumes to finally crash into the fresh paint happened to my K6 tank indoors back in the early 80's.
No wind at all. A fan might have helped there.

Wasps love the paint fumes, not water based. The good unhealthy paint ;D
« Last Edit: June 12, 2025, 08:13:15 PM by PeWe »
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline HondaMan

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Re: Decal Bubbles
« Reply #17 on: June 12, 2025, 08:03:04 PM »
"Colorado's typically unpredictable weather: about 5 minutes into the primer painting, a high wind broke out"

Mark
That reminds me of back in 1984 living in Las Vegas when I went to spray the roof of the full sized school bus (motorhome conversion)white to help reflect the heat, outside of course, I'd get everything taped and masked off and set to spray and the wind would start blowing. I was using regular masking tape and left it taped a couple of days waiting for the wind to stop then tried peeling the paper off that had gotten wet from showers and torn from the wind, the sun baked the tape to the point of having to use thinner to remove the tape, so I had to fully clean up the primer again and re tape 4-5 times before I finally got a wind free day. I think I used an acrylic paint on it, boy was I glad to finally get it done.

My middle brother lives there: he lived there some 30 years before moving back to Missouri (for 7 years) and now he's back out in NV again. He repainted his 1972 Mach I Mustang (last step of his resto of it, owned since new) while in Missouri: he said he'd never try it in Nevada! I've been to LV twice, and both times we were lucky: it was windy, which really offset the heat!
See SOHC4shop.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book
Link to My CB500/CB550 Book: https://www.lulu.com/search?sortBy=RELEVANCE&page=1&q=my+cb550+book&pageSize=10&adult_audience_rating=00
Link to website: https://sohc4shop.com/  (Note: no longer at www.SOHC4shop.com, moved off WWW. in 2024).

Offline HondaMan

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Re: Decal Bubbles
« Reply #18 on: June 12, 2025, 08:06:44 PM »
A dusty big moth that becomes dizzy by the fumes to finally crash into the fresh paint happened to my K6 tank indoors back in the early 80's.
No wind at all. A fan migh have helped there.

Wasps love the paint fumes, not water based. The good unhealthy paint ;D


I think the more unhealthy the paint is, the better it looks when  done?
When I painted the 750 on the cover of My CB750 Book, I was all done but the last coat on one of the sidecovers. As I finished spraying it, a swarm of gnats came out of nowhere and flew straight into it like they were aimed at it. They left a long, arrow-shaped pattern of tiny black dots across the middle of the side cover. I had to let it dry 2 days and strip it and do it over. I think they like(d) lacquer?
See SOHC4shop.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book
Link to My CB500/CB550 Book: https://www.lulu.com/search?sortBy=RELEVANCE&page=1&q=my+cb550+book&pageSize=10&adult_audience_rating=00
Link to website: https://sohc4shop.com/  (Note: no longer at www.SOHC4shop.com, moved off WWW. in 2024).