beppesignori
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| posted on 6/9/08 at 09:13 AM |
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Which foam and where to buy?
I need to make up a slightly modified bonnet bulge to accomodate the secondary injector fuel rail on my CBR engine. Idea is to make a positive mold
ind just lay the glass over it. Working with foam is probaly the easiest, but which foam should I use, and where do I get it?
Cheers, c
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tegwin
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| posted on 6/9/08 at 09:15 AM |
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I have used building insulation foam before....Comes in 6" thick sheets...
BUT....The resin will desolve the foam...
So once you have made up your shape....cover it in packing/duct tape and then lay your resin over it....
Once its cured, pour petrol over the foam to desolve it....or peel it out etc..
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iank
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| posted on 6/9/08 at 09:35 AM |
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The 'proper' stuff is polyurathane foam which doesn't react with the resin - but still needs a shiny coat to stop the it
sticking.
CFS stock it, but it's a lot more cash than B&Q building foams.
http://www.cfsnet.co.uk/acatalog/CFS_Catalogue__FOAMS___CORE_MATERIALS_129.html
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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Benzine
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| posted on 6/9/08 at 09:45 AM |
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quote:
Originally posted by tegwin
BUT....The resin will desolve the foam...
So once you have made up your shape....cover it in packing/duct tape and then lay your resin over it....
Once its cured, pour petrol over the foam to desolve it....or peel it out etc..
Yeah it eats away at it. I took mr whippy's advice and put a couple of layers of PVA over it, made a good seal and then it wouldn't
dissolve 
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twybrow
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| posted on 6/9/08 at 12:56 PM |
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Buy a can of expanding foam from B&Q etc. It is normally PU and should be good with most resin systems you try. Shape it, then spray with
automtive paints, then coat with wax and or PVA. Done.
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BenB
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| posted on 6/9/08 at 01:24 PM |
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Floral foam (otherwise known as Oasis foam) is compatible with most polyester resins.... It's also compatible with car body filler (bondo).
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