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Offline SHORTROUND

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Finished my seat mold
« on: August 09, 2012, 06:40:00 am »
Finished my seat mold. Time for resin and cloth........and a Beer 8)
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Offline SOHC4 Cafe Racer Fan

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Re: Finished my seat mold
« Reply #1 on: August 09, 2012, 09:03:39 am »
That looks great! 
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Offline afkrejci90

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Re: Finished my seat mold
« Reply #2 on: August 09, 2012, 11:09:01 am »
What did you make that out of, foam blocks and sanding?
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Offline knowsnothing

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Re: Finished my seat mold
« Reply #3 on: August 09, 2012, 11:51:01 am »
Quote from: afkrejci90 on August 09, 2012, 11:09:01 am
What did you make that out of, foam blocks and sanding?
+1 Would be very interested in the materials and process.
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Offline SHORTROUND

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Re: Finished my seat mold
« Reply #4 on: August 10, 2012, 05:47:58 am »
The flat base is blue insulation foam; cut then final shape with a disk sander to keep the edge perpendicular. The hump is green florist foam. You can use the blue foam for the entire seat but the green is easier/faster to cut and sand. The rolled eddge is a piece of 1/2" OD tubing. It helps hide the edge of the seat pan and give it smooth line.
Heres a photo of the finished product from my cb450 made the same way.


The mold made with only blue foam. You don't need the rolled edge if you're gonna snap on the cover.

finished seat
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Offline knowsnothing

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Re: Finished my seat mold
« Reply #5 on: August 10, 2012, 07:28:21 am »
Awesome, thanks for the info!  Both of the other seats came out great.  Is the blue stuff in the top picture some special tape for the glass to help release it?  And are the molds destroyed after each use?  (Last questions promise)
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1978 CB750k Green - 811 engine
1978 CB750k Blue - for sale
1974 CB375F Faded Black - had to have that 6th gear
1976 CB400F Red - in many pieces
1973 CB350F TBD - in many pieces

Offline afkrejci90

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Re: Finished my seat mold
« Reply #6 on: August 10, 2012, 10:32:55 am »
I've started making my own seat but with the pink insulation foam board, it takes forever to sand.  I bet the floral foam is probably the better option.  After you fiberglass the mold, do you use body filler to make a smooth surface to paint?
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Offline SHORTROUND

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Re: Finished my seat mold
« Reply #7 on: August 11, 2012, 05:46:12 am »
Quote from: knowsnothing on August 10, 2012, 07:28:21 am
Awesome, thanks for the info!  Both of the other seats came out great.  Is the blue stuff in the top picture some special tape for the glass to help release it?  And are the molds destroyed after each use?  (Last questions promise)

It's 3M blue tape. the molds are destroyed after each use, But you can reuse the 1/2" tubing.
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Offline SHORTROUND

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Re: Finished my seat mold
« Reply #8 on: August 11, 2012, 05:49:07 am »
Quote from: afkrejci90 on August 10, 2012, 10:32:55 am
I've started making my own seat but with the pink insulation foam board, it takes forever to sand.  I bet the floral foam is probably the better option.  After you fiberglass the mold, do you use body filler to make a smooth surface to paint?

Body filler is used to smooth out the surface. the floral foam is much easier to shape but you have to make the seat immediatly. The foam shrinks a little after you sand it.
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