fiberglass inside, instead of outside?

Awesome idea guys. Thanks anarchy really cool.     Cougar still a little confused on your idea, but let me see if I got it. Basically you cut a hole then you take a piece of mdf and cover that hole after your done glassing with a piece that is to cover say the whole back piece, if thats the area you cut out? 

jeff i've tried and tried. I just cant get it to come out smoothly. I think i end up putting more glass in some areas then others and stuff like that. I usually dont have any bubbles now, or at least not many. Nothing thats a big problem. I always end up with tons of bumps in the glass though.

Hey guys something that will make life easier too is this

you do exactly what anarchy said but do this too

make your frame and structure stretch your fleece and fasten it like normal now soak the fleece with your normal resin mix once you have soaked it to the point where you would normally call it done mix one more batch of resin this time mix it 50/50 with bondo add cream hardner and the liquid hardner. Now brush this mix over the wet fleece (do not wait for the orignal resin to dry) let the fleece now dry lay your chop mat on the inside to desired thickness. Now you sand the fleece Guess what it will sand like bondo and will require little or no extra bondo to make perfect.

hope this helps

ya you got it  reality ,it levels the surface so ther isnt so much bondo work to do and cuts down prep time huge.

The only Con to this that i can see is if someone were to use this mix to soak the fleece right through. You have to make sure you have the fleece 100% soaked through with just resin and hardner before applying the 50/50 mix. While applying the 50/50 mix just use enough to cover the whole surface you dont want it to soak completely through the fleece or it will be weaker than the rest. I mix mine about 70% bondo 30% resin this way it stays pretty think and will stay on the surface the best part is it will sand like bondo not rock hard resin.