Author Topic: Can you paint shock springs?  (Read 1216 times)

0 Members and 1 Guest are viewing this topic.

Offline gary p.

  • Full Member
  • *
  • Posts: 43
Can you paint shock springs?
« on: August 24, 2022, 04:50:18 AM »
Searching this, I didn’t find any suggestions for painting rear shock springs.  I have several sets that had rusted and will never look good, except from a distance.   Late model bikes I’ve seen have gloss black painted springs.
I wonder what is the best type paint for this that won’t flake off when the springs compress.
Has anyone painted the springs?

Offline Shtonecb500

  • Master
  • *****
  • Posts: 1,652
    • Youtube profile
Re: Can you paint shock springs?
« Reply #1 on: August 24, 2022, 06:16:33 AM »
drop them off to get powder coated
73/74'' CB500/550 resto-mod - sold
75' 750f 91' cbr f2 swap cafe - mock up
74' 750 chopper hardtail - complete - sold
74' CB750/836kit - Black mix & match - daily rider - always tweaking
71' cb500 K0 survivor - complete
71' K1 - CANDY GOLD/BROWN Winton kit - in process

Offline CycleRanger

  • No comment about being an
  • Really Old Timer ...
  • *******
  • Posts: 5,453
  • Central Texas Shop Manual Advocate
Re: Can you paint shock springs?
« Reply #2 on: August 24, 2022, 06:50:03 AM »
VHT Epoxy gloss black should work pretty well.
It's got a picture of a spring right there on the can. :)
I use this without primer and have gotten good results, I used it on my XL250s springs a few years back and there's no sign of cracking.
Surface prep is very important. If there's rust it will need to be removed.


« Last Edit: August 24, 2022, 09:53:03 AM by CycleRanger »
Do you have a copy of the Honda Shop Manual or Parts List for your bike? Get one here:
https://www.honda4fun.com/materiale/documentazione-tecnica
CB750K5        '79 XL250s     CL350K3
CB750K3        '76 XS650      '76 CJ360T

Offline SOHC4 Cafe Racer Fan

  • Speak up, Whipper-Snapper! I'm a
  • Really Old Timer ...
  • *******
  • Posts: 15,733
  • SOHC/4 Member #1235
Re: Can you paint shock springs?
« Reply #3 on: August 24, 2022, 09:18:58 AM »
Do not paint your springs.  The paint will crack and flake with the flexing of the spring.
1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline Shtonecb500

  • Master
  • *****
  • Posts: 1,652
    • Youtube profile
Re: Can you paint shock springs?
« Reply #4 on: August 24, 2022, 02:04:36 PM »
Do not paint your springs.  The paint will crack and flake with the flexing of the spring.

Thats what I was thinking but they have to be powder coating new springs, right? The epoxy or rubber paint might actually work but they are so exposed to the elements are they really gonna stay nice or hold up very long?
73/74'' CB500/550 resto-mod - sold
75' 750f 91' cbr f2 swap cafe - mock up
74' 750 chopper hardtail - complete - sold
74' CB750/836kit - Black mix & match - daily rider - always tweaking
71' cb500 K0 survivor - complete
71' K1 - CANDY GOLD/BROWN Winton kit - in process

Online seanbarney41

  • not really that much younger than an
  • Really Old Timer ...
  • *******
  • Posts: 10,861
Re: Can you paint shock springs?
« Reply #5 on: August 24, 2022, 02:08:55 PM »
I believe there is a paint additive designed for use on flexible parts...you are not gonna get it in a spray can probably
If it works good, it looks good...

Offline Kelly E

  • Geriatric Hooligan
  • Master
  • *****
  • Posts: 2,388
Re: Can you paint shock springs?
« Reply #6 on: August 24, 2022, 04:08:20 PM »
I painted the springs on this set of Fox shocks in 2018 and I just took them off the bike last week. Plenty of miles on them.
Never Give Up - Never Surrender

The Rust Bros. Garage Collection
1974 Honda CB 550 K0                                            1971 MGB/GT
1975 Honda CB 400F Super Sport                          1972 MGB/GT
1977 Kawasaki KZ 1000 LTD                                   1985 GMC S15
1978 Kawasaki KL 250
1980 Suzuki GS 1100E
1982 Honda CB 900F Super Sport
1983 Honda CB 1100F
1984 Honda VF 700S Sabre
1984 Honda VF 1000F Interceptor
1990 Moto Guzzi 1000 Le Mans
1994 Kawasaki Concours ZG 1000A9
2005 Harley Davidson Fat Boy

Offline Gurp

  • I'm no.......
  • Master
  • *****
  • Posts: 2,091
  • Once was a...
Re: Can you paint shock springs?
« Reply #7 on: August 24, 2022, 04:38:26 PM »
I've seen people use wheel coating in a can and rattle can bedliner with good success.

As with any type of painting surface prep is key.
slow Progress 74 cb550.

Poor boy chop 73 CB500 chop

Future project 77 Cb750 Amen Savior

Offline gary p.

  • Full Member
  • *
  • Posts: 43
Re: Can you paint shock springs?
« Reply #8 on: August 24, 2022, 05:27:57 PM »
Thanks all.  The best of them were soaked in evaporust… a couple of years ago.  From a few feet, they looked pretty good, but the chrome is peeling away on the inside surface, so I don’t expect them to stay rust free once exposed to the weather.   The springs on my street twin are painted or powder coated, not sure what.  Isn’t powder coating hard and likely to crack and flake?  I’ll take that question to a local shop.   More to come.   
All of my old bikes has some level of rust on the springs.  I was always at them with strips of cloth and polishing paste trying to keep them shiny. 

Offline grcamna2

  • Not a
  • Really Old Timer ...
  • *******
  • Posts: 15,211
  • I love to restore & travel. Keep'em Going Strong !
Re: Can you paint shock springs?
« Reply #9 on: August 24, 2022, 06:23:30 PM »
Thanks all.  The best of them were soaked in evaporust… a couple of years ago.  From a few feet, they looked pretty good, but the chrome is peeling away on the inside surface, so I don’t expect them to stay rust free once exposed to the weather.   The springs on my street twin are painted or powder coated, not sure what.  Isn’t powder coating hard and likely to crack and flake?  I’ll take that question to a local shop.   More to come.   
All of my old bikes has some level of rust on the springs.  I was always at them with strips of cloth and polishing paste trying to keep them shiny.

Powder coating is a type of plastic.

I used VHT gloss black caliper paint on a pair of rear shocks and after I prepped and painted them I oven-cured them both at 200 degrees for an hr. as recommended on the can;they've been holding up very good and look great  :)
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline Shtonecb500

  • Master
  • *****
  • Posts: 1,652
    • Youtube profile
Re: Can you paint shock springs?
« Reply #10 on: August 24, 2022, 07:28:44 PM »
Thanks all.  The best of them were soaked in evaporust… a couple of years ago.  From a few feet, they looked pretty good, but the chrome is peeling away on the inside surface, so I don’t expect them to stay rust free once exposed to the weather.   The springs on my street twin are painted or powder coated, not sure what.  Isn’t powder coating hard and likely to crack and flake?  I’ll take that question to a local shop.   More to come.   
All of my old bikes has some level of rust on the springs.  I was always at them with strips of cloth and polishing paste trying to keep them shiny.

Powder coating is a type of plastic.

I used VHT gloss black caliper paint on a pair of rear shocks and after I prepped and painted them I oven-cured them both at 200 degrees for an hr. as recommended on the can;they've been holding up very good and look great  :)

boom.
73/74'' CB500/550 resto-mod - sold
75' 750f 91' cbr f2 swap cafe - mock up
74' 750 chopper hardtail - complete - sold
74' CB750/836kit - Black mix & match - daily rider - always tweaking
71' cb500 K0 survivor - complete
71' K1 - CANDY GOLD/BROWN Winton kit - in process

Offline Shopdog

  • Enthusiast
  • **
  • Posts: 141
Re: Can you paint shock springs?
« Reply #11 on: August 25, 2022, 04:35:19 AM »
I believe there is a paint additive designed for use on flexible parts...you are not gonna get it in a spray can probably
I spoke to my local auto paint supplier about this. They still have flex agent they can sell you, but he told me he can't remember the last time any of the local paint shops ordered it from him. Evidently, today's coatings are more flexible to resist cracking. That does make sense if you think about it. Newer vehicles have a lot of painted plastic. I guess the coating manufacturers felt it would cause less problems/complaints if they made their products more versatile.

Offline SOHC4 Cafe Racer Fan

  • Speak up, Whipper-Snapper! I'm a
  • Really Old Timer ...
  • *******
  • Posts: 15,733
  • SOHC/4 Member #1235
Re: Can you paint shock springs?
« Reply #12 on: August 25, 2022, 08:30:42 AM »
I believe there is a paint additive designed for use on flexible parts...you are not gonna get it in a spray can probably

Correct. You need to add a flex agent to the paint or it will crack.  Most spray paints do not have a flex agent additive.
1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline Kelly E

  • Geriatric Hooligan
  • Master
  • *****
  • Posts: 2,388
Re: Can you paint shock springs?
« Reply #13 on: August 25, 2022, 10:24:51 AM »
I believe there is a paint additive designed for use on flexible parts...you are not gonna get it in a spray can probably

Correct. You need to add a flex agent to the paint or it will crack.  Most spray paints do not have a flex agent additive.

I've painted several sets of springs with Seymour MRO spray paint and primer as well as Rust-Oleum with no issues at all. No flex agents used.
Never Give Up - Never Surrender

The Rust Bros. Garage Collection
1974 Honda CB 550 K0                                            1971 MGB/GT
1975 Honda CB 400F Super Sport                          1972 MGB/GT
1977 Kawasaki KZ 1000 LTD                                   1985 GMC S15
1978 Kawasaki KL 250
1980 Suzuki GS 1100E
1982 Honda CB 900F Super Sport
1983 Honda CB 1100F
1984 Honda VF 700S Sabre
1984 Honda VF 1000F Interceptor
1990 Moto Guzzi 1000 Le Mans
1994 Kawasaki Concours ZG 1000A9
2005 Harley Davidson Fat Boy