Posterboard and masking tape?

I searched on this but didn't find anything difinative. I was wondering whether polyester resin would have any trouble penetrating the blue painters masking tape and/or posterboard? I have a uniform curve that I need to get something to form (surrounding a spare tire), and fleece is not stretching uniformly enough for my tastes even if I gather the edges. If not does anyone have any other recommendations?

Mask off the area you are trying to do, use the poster board or anything else you need to obtain the shape. Then cut strips of fiberglass mat and use that to do the actual curve. Just make sure that you mask everything thing off so nothing becomes pemanently attached to the car.Certified Security Specialist

Always check info with a digital multimeter.

I promise to be good.

Tell Darwin I sent you.

I've been sick lately, sorry I won't be on much.

I think you were intending to do this but just make sure, tape up the posterboard too. Wet posterboard might be messy.Nik

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I actually just went another way due to tripping over a flash of inspiration. I had a larger tire on rim from another car that I tripped over in the basement, and when I measured the area that I wanted to use and test-fit my framework on the tire, it actually worked perfectly. I've got the tire wrapped in aluminum foil and I have cotton (t-shirt) stretched over the framing up against the foil-wrapped tire. That and a few clamps to keep things from shrinking when they cure and I should be all set. Thanks for the quick replies through!

Cool. I love improv. If it works use it.Nik

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Hey man get us some pics if you can.  We'd love to see your work.Learning the trade one fiberglass creation at a time!

This is just the mold I am using so that I can do the layup outside the car, so ignore the air bubbles, they won't be a part of the enclosure. I thought about using this as part of the enclosure, but decided that I didn't want the extra weight of all the MDF.

So you're going to be making an enclosure that fits over your spare tire, but still in your spare tire well. If thats not it thats still an awesome idea. If you can get your air space to work. Learning the trade one fiberglass creation at a time!

I should be able to squeeze 1.1 ft3 per sub while still having access to the spare. The open end toward the clamps will have another piece (not pictured) that will fit flush against the seat (it's just easier to make the mold in parts due to the angles). In front of the enclosure I will be putting in a amp rack that holds one on top and one underneath (sort of an H-shape), and I will raise a false floor on both sides with ~.75 ft3 compartments for tool storage. With everything in place it will leave just about enough space for a pack of gum or pack of cigarettes (these cars have a very pathetic excuse for a trunk -- I've still got a Saturn wagon for parts-hauling and trips to the airport so I really don't mind though LOL). On a side note, one idea I am playing with is taking the finished casting and coating it inside and underneath with RTV silicone (room temperature vulcanizing) to cut down on resonance and any panel contact -- anyone ever try this?