Re: gel coating floor
You can easily roll on a one color non skid gel coat surface, if you want it webbed, then it adds to the work.
Webbing needs to be sprayed for the best results, you can use a very cheap $19.00 spray gun from Harbor Freight, but you need to buy the webbing solution. You can get it at fiberglass supply stores, or on the internet, but it may be a little harder to find than gel coat. The more webbing solution you add to the gel coat, the stringier it gets, air pressure and volume will change the pattern also, you just need try a few things and see what look you like.
You will need to remove all the glue and sand the surface very well, pits in the glass won't be a problem if you roll the gel coat. You can get non skid sand at most any hardware store, use a very fine grit.
Roll on the first coat of gel coat and before it hardens sprinkle the sand on it, a salt shaker or similar container works well. You can mix the sand into the first layer of gel coat instead, but sometimes it clumps up when you roll it on. Apply as much, or as little sand as you want, it's up to you.
The second layer of gel coat will have wax in it so the surface will cure tack free. If you want it webbed, then you need to spray it on before the second layer of gel coat hardens.