New build

[Eric_M]

Yes is does, it melts very nicely. You can use epoxy resin and lightweight cloth for the first layer (epoxy doesn't melt foam) or cover the foam in brown parcel tape, protects the foam and is a brilliant release tape (the tape can go a bit ripply ( new word ?) and gives a cr8p finish sometimes but does work

[CNHSS1]

as Eric says, polyester resin (normal stuff for GRP lay up) will attack most although not all expanding foams. Tip re parcel tape is a good one though, if you use genuine 3M Scotch parcel tape (dearer per roll...) it doesnt give the wrinkling effect.
Good work BTW

[Minisprinter]

Had'nt thought or heard of using parcel tape before, it may well be worth giving it a go. Our thoughts were if the resin did melt the foam then to cover the whole thing with body filler and then smooth that off.

[AllanMcD]

I have always used duct tape I used to crash motorbikes a LOT so got quite good at repairs
I have just finished moding my air box my hands still smell of f/glass.
Allan

[guilleracing]

Experience tells me that the parcel tape is good if you don't let it get warm, the glue releases and contaminates the mold. I have had some success with the blue release agent on the finished thing. (The fluid that looks like ink.) When it goes on the mold looks a bit rough but the finished article comes out fine.

Greg.

[Tanky]

just brush it with a couple of coats of PVA glue before you start laying up.

[redturner37]

That also works well enough for me Glen.....

[Minisprinter]

The roof vent is looking better after having taken the extension off it. We have also tonight been getting some shape into the foam. We need to add a little more into a few places tomorrow but we are getting an idea of the rough shape.

[Minisprinter]

well i used your advice and used gaffa tape with some release agent on it. We got the foam shaped first with a surform before giving it a light sanding. Once both sides had a similar shape we put the tape on, let the release agent dry then got some fibreglass laid up on one side. Once we had 3 layers of glass on the foam we fitted the front end and laid up some more glass to make an edge which will make the front look as if it is sitting flush.
I'm going to have a look tonight and see if it has dried enough for us to remove the foam and continue with making the mounting area stronger before we start to smooth them off and also get the other side done.
I've never worked with fibreglass so this is a bit of a learning curve for me but paul (in the picture) has and seems to be quite confident which has certainly been a great help.

[redturner37]

Is there a chance that you could leave some of that foam in there, would certainly soften the blow in the event of a collision....