Questions on building a fiberglass sub box

Hi all,

I'm wanting to build a sub box to fit under the back seat of my truck. In order to maximize the space back there, I want to create a fiberglass/MDF box.

The only piece of the box that would be FG is the bottom - basically to follow the contours of the floor. The sides and top would be MDF.

I've been doing some reading around on FiberglassForums and I have a pretty decent idea of what needs to be done. However, I'm not quite sure exactly how I should go about this.

In a lot of the tutorials I have seen, a sheet was stretched and stapled to a box so that FG could be laid and you get a smooth contour. Seems reasonable... but I'm not sure how to do this in my particular case...

Since the bottom would be FG, and the sides/top are MDF... should I just create a mold of the floor first, then go about attaching the FG to the MDF sides, or should I have the MDF sides in place, and mold the floor and attach to the MDF at the same time?

I'm thinking that maybe the first way I'm thinking of doing this is more correct, but I'm curious to see what you guys have to say.

Thanks,
Cartman

here is what i would do i would mold it to the floor shape first ans then attach it to the MDF for the side and top of the box

Cool... thx. That is kind of what I was planning. Good to hear someone else would do it the same way. :)

Cartman

Heres the quick easy way to do it , get some heavy duty tinfoil ,apply it and smooth it out across the floor apply mold release then spred out fleece across the floor getting it into the contours ... Next apply a good coat of resin across it and allow it to harden , then carefully remove the piece and now coat the bottom with a thin coat (too thick it might not fit well)
I'm not sure power/subs you are using , multiple layers of fleece/glass might be required to be strong enough

do what venge said, that's what i was gonna say. basic lower end subs 3-4 layers of fiberglass will do the job.