[EDNY]

Have the fiberglass fenders mocked up on my 33M now, they are a thin pour so I would like to reinforce them.  One of the kit car forums suggested using garden hose fiber-glassed on the bottom side. It's flexible and offers strength. (kinda bulky)

Another forum suggests using cardboard....they say once the resin penetrates the cardboard it really stiffens up.  Just ordered some 18oz fiberglass mat to use for the process. Will need to make and laminate metal attachments points also. 

Any other suggestions?

Also, fiberglass appears to be rated for 150 F degree tolerance..any experience with panels being too close to headers?

[sammons]

Ed, I don't understand the garden hose thing or the cardboard. If the fiberglass is rather thin, just rough up (60-80 grit minimum) and lay more mat. If i'm building up thickness I use the heavy (Evercoat Sea Mat?) and laydown two layers at a time. If it needs more, make sure you rough up after it has dried or it won't adhere.

2" should be pleanty of clearance on exhaust to glass, unless you are next to a cat converter. I had a muffler shop build a complete exhaust on my 69 coupe and I kept smelling a funky burn smell on long trips. Years later I noticed he was 3/4" away right under my trottle pedal, no wonder my foot was always hot!  When I moved it down I noticed it had kinda melted that area just a bit, must have gotten luck on the fire thing

[EDNY]

Thanks sammons..figured you would jump in. Apparently cardboard is a common practice... but like I mentioned I have 18oz fiberglass mat ordered the stuff sold by Bondo in Advance Auto Parts is approx 1.5oz

They also use foam PVC board..but the fiberglass mat is cheaper overall.  When the 18oz stuff arrives I'll make the call then...but I bet that will be my "cure".