995 gave me this advise on reinforcements:
You'll need :
-80 grit sand paper
-Glass cloth
-1 quart of resin and a tube of hardener
-3 disposable paintbrushes (2")
I got everything from Lowes for under $20
You'll also need some sort of mixing bowls and sticks, but I had that laying around.
Install your mount. Cover the inside of the vehicle with drop cloths (this is much easier without the seats). Put on old clothes.....don't skip that step. Mark the area surrounding the mount 20" by 20" with a pencil. Sand inside this area with 80 grit paper. Cut a bunch of fiberglass. Start with two sheets 18"X18", then two 16"X16", then two 14"X14". Make sure to cut a hole in the center of each where the mount will be....you can't glass over the center conductor. I DO glass over the mounting bolts, but I add an additonal bolt close to the center conductor for the coax shield to connect to. If you do not do this, the leave one of the mounting bolts uncovered....it will still be plenty strong. Regardless of how you decide to do it...just make sure that you have some bare metal somewhere to connect the braid to. That resin doesn't want to come off once it's on. Mix up some resin (about 6 oz), and paint it over the sanded area. Add one layer of 18"X18" glass cloth, paint it again, add the second 18"X18" then paint it again. Make sure to get all the bubbles out, and make sure the cloth is fully soaked (they make a squeegy type tool for this, but I have never used one). You will be able to see any air pockets or dry areas very easily. Just work the bubbles out and soak it dwon good. While the first two layers set up, get a coffee or beer and mix another batch of epoxy and proceed to the 16"X16" sheets. Repeat, reapeat. You don't want the resin to fully harden between coats. If it does you have to sand it again. So keep working while it's tacky. On the other hand, you have to let it set up a little. Doing anymore than two layers of glass at a time and it will want to fall off.
