Fibreglass and foam

[MikeyG]

I've read on here that fibreglass eats/melts some foams. Just wondering if 2 pack epoxy resin eats away at the dense closed cell foam used in camping sleeping mats. Thanks

 

[vandernf]

best way to know for sure is to just do a small sample run. I use 3m epoxy resin and then cover any foam i use in masking tape and a mold release wax before adding glass to it. this helps with the release and by the time the glass is dry, it doesn't really matter if the foam melted a bit.

 

[carbon moto]

best way to know for sure is to just do a small sample run. I use 3m epoxy resin and then cover any foam i use in masking tape and a mold release wax before adding glass to it. this helps with the release and by the time the glass is dry, it doesn't really matter if the foam melted a bit.

we do the same with epoxy & polyester resins

 

[jsharpphoto]

i've mostly heard about this with styrofoam, not padding foam.

 

[carbon moto]

i've mostly heard about this with styrofoam, not padding foam.

we use a 2 pack expanding foam for making the original plug
we have used insulation foam before & carved it.
dont know about padding foam (why would you want to?)

 

[SONICJK]

(why would you want to?)

This is what im wondering?
Seems an expensive way to make a seat mold...

 

[carbon moto]

This is what im wondering?
Seems an expensive way to make a seat mold...

every way to make a seat mould from scratch is expensive if you make it to last for making more than one seat- with all the filling & prep then painting the plug to a high gloss finish + making the actual mould i would expect 1 new seat & mould costs me around £400-£600(a lot of that is time, as a business we have to account for that too!) to develop & make - some of our moulds have had 100's of seats made out of them.
The products for making the mould (tooling resins) cost 4-5 times more than the ones used for making the actual seat.
padding foam is soft & cannot take shape (& is not cheap) so what will it be used for in this process

 

[SONICJK]

every way to make a seat mould from scratch is expensive if you make it to last for making more than one seat- with all the filling & prep then painting the plug to a high gloss finish + making the actual mould i would expect 1 new seat & mould costs me around £400-£600(a lot of that is time, as a business we have to account for that too!) to develop & make - some of our moulds have had 100's of seats made out of them.
The products for making the mould (tooling resins) cost 4-5 times more than the ones used for making the actual seat.
padding foam is soft & cannot take shape (& is not cheap) so what will it be used for in this process

I was talking about a one off lay the glass over it and then scrape it out into the trash kind of mold
I would hope youre not using camping mat foam to make your professional multi use molds ;D

 

[carbon moto]

I was talking about a one off lay the glass over it and then scrape it out into the trash kind of mold

we do often make a 1 use mould for customers & just use the cheapy method then bin it

I would hope youre not using camping mat foam to make your professional multi use molds ;D

there is only one thing i would use that for
camping!! ;D

 

[jsharpphoto]

I think my comment was taken out of context, or I misspoke. I certainly don't use closed cell foam for mold making.