Making a fiberglass hood as a project. Question is, is there a minimum amount of layers i should be applying for safety? As in, can the hood be SO light that it can break away from my 4 hood pins while driving? Out of a mold, im thinking about 4-5 layers of 6oz cloth.

Hopefully you guys know what i meen and i dont get flame for this.

I would go more for thickness than weight. 1/4 inch should be plenty.

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Nic
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factory fiberglass pieces are way thinner than you might think. I would always recommend overkill, but on the other hand stock panels on vettes and mustangs and whatnot are maybe 3 layers of fairly light cloth. thicker at the corners and mounting points.

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Nelson Hays
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Odd enough I'm working on a hood project myself. Have you considered what you are going to use to reinforce the underside of the fiberglass hood from flexing? For example an under skeleton to brace the hood (similar to how OEM hoods are made, but out of fiberglass).

Guys, I was thinking about bonnet for my Focus as well, and what I've found might give you some idea what could be possibly done I know the website is from UK, but you can always find some local suppliers
Polyester Glassfibre / Fibreglass Tube - East Coast Fibreglass Supplies

Ok good advice. On corners i may go heavier then. Im just worried about the shape of my hood and how ridged it should be. On the A4's, the grill is part of the hood. There for, in my thinking, air going into that grill is going to make more lift under the hood when driving, i want this thing to be strong enough that i dont have to worry about it making stress cracks or even worse being so thin that a big rock form a truck doesnt come along and shatter it as i drive. (Long Island Expressway). lol

I was thinking about glassing the underside of the good and then using that glass as the reinforcement for the hood skin, i think thats something people do too. In thought, it seems to have the ability to make the hood skin more ridged with adding the least amount of glass (weights important obv).