here ya go old post about them
http://www.wellcraftv20.com/community/showthread.php?t=4130
Crack Repair's 101
Tools of the Trade or may need for some to most repairs.
Grinder, Air Ginder, Air D/A Sander, Air Line Sander, Air Palm Sander, Air Die Cutter, Air Gun, Leather Hammer, Safety Glass's, Safety Mask, Gloves, fiberglass roller, fiberglass, Resin and hardner, and Not pictured cheap paint brush and sharp sissors.
here's the crack i had before repairs ( didn't really need to go this extreme for this small crack but only crack i could find to fix ) LOL
Take the grinder or die cutter and cut in just the cracks into the glass as seen below.
Take the grinder now and grinder the glass down in the center of the crack or cracks like a V shape or valley so you can layer the glass for better and stronger bonding. till you have the crack cut line hard to see.
now blow out the area clean then take the sissors and cut the glass to fit in the area you have ground out.
Now cut a second piece of glass that is smaller and just covers the crack.
now mix your resin and hardner up and either brush or in this case just take your finger with the gloves on and rub resin in the area to be repaired. then soak the smaller piece of glass and then lay it in the center and either roll it out or just use your fingers to get it smooth with no air bubbles.
now soak the larger piece of glass and lay it on top of the smaller one to cover the entire area you ground out and roll it or use your fingers to smooth it out too.
then pour some of the left over resin on the repair and let it soak in all and wait for it to cure.
This is my patch i did today and is now curing.
Any other questions ask away hope this helps guys. good luck. ;D
Any clean up can be done easily with Lacquer Thinner.
Will post the sanding and finishing once this job dries probably tomorrow.