The extreme AreoCRX-HF project

[ebacherville]

last night i pulled out my forms and drew my profile on the inside walls ready to be cut down.. got the hatch opened up again.. the struts still hold it up even before trimming

Waiting for the foam to cure up still.. rushing this process could mean drastic problems.. but yet until I get the hatch part done i cant do the rest of the tail... oh the drama

[Tango Charlie]

Originally Posted by ebacherville

Progress:
heres is a warning PINK FOAM INSULATION melts with fiberglass.. use the foil backed yellow foam insulation .. found out the pink foam isn't the stuff to use..

You must be using polyester resin. To 'glass over foam, use epoxy resin. But it's more $$$ and touchier with the catalyst ratio. i.e., You can't speed it up with more catalyst. To obtain full strength it must be mixed to its specified (on the label) ratio. If more catalyst is added, it may not even cure completely. But anyway... It sounds like you found a way to work around it.

[ebacherville]

Originally Posted by Tango Charlie

You must be using polyester resin. To 'glass over foam, use epoxy resin. But it's more $$$ and touchier with the catalyst ratio. i.e., You can't speed it up with more catalyst. To obtain full strength it must be mixed to its specified (on the label) ratio. If more catalyst is added, it may not even cure completely. But anyway... It sounds like you found a way to work around it.

YEah im just using what i can get easily .. bondo brand fiberglass resin.. works well if using compatible materials.. .. and i assumes thats what people are looking for readily available materials they can pick up anywhere..

[ebacherville]

well checked on the foam today and its still curing still a few soft spots.. hopefully tomorrow it will be good to go..

[COMP]

what about a primer-sealer then the resin ???

[ebacherville]

well i went out and started shaping one side.. its looking good but ran out of light.. tomorrow ill finalize the shape then try to match the other side..

[ebacherville]

Originally Posted by COMP

what about a primer-sealer then the resin ???

primer melts the pink foam also , the white/yellow foam it doesn't..

[COMP]

Originally Posted by ebacherville

primer melts the pink foam also , the white/yellow foam it doesn't..

OK

[rcpmac]

This 2 part foam is one solution to your curing problems.

http://www.pegasusautoracing.com/productdetails.asp?RecId=103

8

"This polyurethane foam kit produces a rigid foam with a density of about two pounds per cubic foot. It is ideal for making custom fitted seats or for strengthening composite body parts. When the two parts are mixed, they begin to react within about one minute. Most of the foaming occurs within the next several minutes. About 15 minutes is required for the foam to set. Allow several hours before any secondary operations are attempted such as sanding or carving (if required). The resulting foam will not absorb water and is not affected by polyester resin, epoxy resin, gasoline or oil. The compressive strength of the foam is 36 psi. It can withstand operating temperatures of up to 200°F. One kit is enough for about 3 typical formula car seat inserts."

I would have been inclined to use ridged foam block, carve the shape and glass over it.

[ebacherville]

the foam isn't really a problem just takes extra time.. however a few hours would save some time.. but that OK things are moving along fine.