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Old 08-11-2005, 05:51 PM
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making a fiberglass spoiler?

hello,

need a little help here. i am redoing a 66 mustang. would it be possible to make my own fiberglass spoiler? what i want to do is make one like what they have on the 67-68 camaros. for those of you who dont know, they are a sperate bolt on spoiler that just attaches to the trunk. they are not actually molded onto the trunk lid. i can buy a new fiberglass deck lid with a spoiler already on it, but i think it sticks up to high. i only want one about two inches tall. i was wondering if i could make a mold and fill it full of that spray in foam, then when the foam dries, shape it the way i want my spoiler to look. then once its shaped coat it in fiberglass, then sand , paint to match car.
would this be possible, or has anyone done something like this, or is this not making any sense to anyone? thanks in advance

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Old 08-11-2005, 06:59 PM
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Makes sense to me..Use blue foam and carve it to shape and then glass it..Regular styrofoam melts when you get resin on it..Test your foam to see that it does not do that..tape some wax paper to the deck lid so resin does not stick to your deck lid..and glass away..

OMT
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Old 08-11-2005, 07:10 PM
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OMT is right. Use the blue or pink foam board from Home Depot or Lowes. The spray foam does not actually get hard enough to hold a shape and it's not sandable. The foam board sands great with a block and 80 grit.

proto
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Old 08-12-2005, 08:40 AM
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To prevent the styro melting with the polyester resin, you can use the brown plastic (polypropylen?) tape used for parcels, it works great, the hardened resin do not bond onto.
The white EPS in middle density works great, too, but is less accurate than the styro.
give some pics of your project.
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Old 08-13-2005, 04:54 PM
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on the blue foam from home depot, how do you glue pieces together? the only stuff i can find is 3/4 inch. i need to glue enough pieces together to get about 2-3 inches. also, what do i use to coat it with when im done shaping and still keep it smooth enough to paint? some say use fleece, some say to use fiberglass cloth, or does it really matter that much as long as you use something? thanks in advance again
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Old 08-13-2005, 05:56 PM
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Use titebond glue..that is a brand available at Home Depot.use plenty..spread it with a spreader and then clamp it or weight it over nite...On exterior stuff I use mat and cloth..fleece is fine on interior stuff..tho some may differ...get your foam as smooth as possible as any little humps and dips show up in the finish and can be hard to get rid of..

A bandsaw can be used to get the major shape..

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Old 08-13-2005, 06:37 PM
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thanks.

is there a certain type of titebond glue, is that the brand or the type?
what about gel coat, will i need to use that?

thank you for all the help/info
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Old 08-13-2005, 08:30 PM
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Quote:
Originally Posted by project66
thanks.

is there a certain type of titebond glue, is that the brand or the type?
what about gel coat, will i need to use that?

thank you for all the help/info
titebond is a brand..you will not need gel coat..use a surfacing primer like evercoat rage over your glass and then paint the piece normally as you would anything else..use 2 or three layers of glass..the glass is the actual structure the foam just gives the shape..

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Old 08-13-2005, 08:52 PM
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thanks for the help. got everything now. hopefully get started on it in the next few days
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Old 08-14-2005, 01:34 PM
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Glueing Foam

Project,
This is how I would go about it.
If you want to use foam, any kind of foam and do not want to worry about it melting from polyester resin (fiberglass resin) Use epoxy. It does not melt foam. If you use a poly based foam, you can shape it with a 80 grit on a block and or high speed 3" angle grinder and knife - hand saw. Another option is to make the piece out of wood (easy to shape), coat it with heavy wax and lay cloth over it. Build it up with a couple of couple of layers, then finish outside. If you wanted, you could fill the center with chopped fiberglass (Household insulation works great) dipped in resin. I would use epoxy all the way myself. You can get it from marine suppliers and some body supply shops.

Just my 2 bits worth
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Old 08-15-2005, 03:34 PM
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For glueing the foam together I use the 3M spray adhesives. (I forget exactly which part no.), but the stuff is virtually instant. Spray one piece, spray the other, wait three minutes. Press the two together and they aren't coming apart. (Make sure you position accurately.) I do like to use epoxy instead of polyester resins because it will not melt the styrofoam. When I don't want the foam to be a permanent part of the final part, I cover it in plastic box tape as someone else mentioned. (The epoxy will NOT stick to the tape.)

I've never tried using the tape with polyester resin though. Anybody done that? Will the polyester resin melt the tape?
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