Thank you Smokin Joe. Would bees wax be hard to get off the paint ?

You can buy a releasing agent that you spray on.
It would give smoother results rather than using something that will be wrinkled.
Also, the piece that you will remove from the outside will be larger than what is needed inside.

For an inexpensive mold release, try spray on, 'Hair Spray'. I think the stuff I got last time was the OV5 stuff. Get the cheapest stuff you can find, it will have the most solids in it. Hair spray is water soluble, so just wet it down with a hose or wet rag when it's time to take things apart. Dribble water along the edge of your fiberglass seam and let it creep back under. A bit of air pressure at the same time will help lift the fiberglass off of the mold. If you can wax the mold first, (100% carnauba wax is the best, the resin won't attack it) then spray the mold release, it will seperate quite nicely for you. You can always give it a little practice run with something before hand to see how it all works.

OK, a lot to fathom for me. I am not concerned about a smooth finish or being too large. The finish will be hidden under batting and vinyl and as for size, I am more concerned with shape and I can cut it down to size to fit once I have the shape. Do I need a gel coat (whatever that is) if it won't be seen ? As I say, all I need is the shape. I love the idea of a practice run on something. Excellent idea. Unless you advise against it, I would like to try covering the panels in saran wrap and/or aluminum foil. That way any run off can be caught in a small trough I could make in the foil so spillage doesn't run down the side of the car. It doesn't matter about the foil or saran wrap sticking to the fiberglass. It won't be seen. I communicated with a gentleman in California at Tap Plastics who specializes in fiberglass. He suggested I lay a coat of speaker fabric over the panel and then coat it with Bond coat polyester resin. Can I buy bond coat polyester resin here in Canada ? Anyway, he said to first apply the speaker fabric, then brush on bond coat polyester, then add the fiberglass and bond coat that as well. Let it dry and job done. So I contacted Kawartha TV and Stereo to see if they carry speaker fabric but no luck. I'm wondering if any porous fabric will do ? To sum up, maybe I am way off base with saran wrap and/or aluminum foil but a practice piece sounds very wise. Does this all sound absurd to everyone ? I thought a thin, resilient but firm fiberglass headliner made sense. Opinions greatly appreciated. Thank you all.

A wealth of knowledge is to be found here. How did you line Dog Spit ? I remember looking at how nice the inside was. I will check out amazon.ca for speaker fabric. Thank you Warren.

gel coat is for a fine outer finish
if doing inner structural pieces that never show you don't need it

gel coat IS what you're looking at when you see a fiberglass boat

by that token ..NEVER sand it off something you're working on as it seals the surface of the fiberglass so your paint dosent sink into it like water on a sponge

www.amazon.ca/s%2Caps%2C177&ref=nb_sb_ss_i_3_11

Well I've reached that point long past what we call embarrassing and rightfully so. I should have realized some time ago, just check Amazon. Thank you Warren for being so patient with me. I must frustrate you with my ignorance. Incredibly slow more often than not. And thank you Iwannagofast. I imagine landscape fabric might do but fiberglass really wasn't all that expensive. It might even be less than landscape fabric. Now if the weather would just cooperate. Oh well, lots of other stuff to do in the meantime. But first things first - Amazon ! Thank you again. So kind.