fiber glass will stick to almost anything if the surface is right, if its smooth bust out a wire brush or some like 80 grid sand paper. scuff the crap out of it make it all tore up looking.. use a paint brush and saturate with just the mix, 1% hardener. is the strongest with the no name glass i use. takes 20 mins or so with a hair dryer to get it to dry enough to work with. after you saturate with glass, lay down some long stranded fiber glass, make sure the fibers hug the shape of your object 100% to ensure strength.. gaps and bubbles will weaken it terribly. the weave is a good way to go.. it flexes alot more before cracking, and holds up alot better overall with a layer or 2 of weave. id say 6 layers total, 2 weave 3 long fiber, or 1 weave 5 layers fiber. but after you place your last layer of fiber you will need to build up a top coat of just class.. so apply some glass.. wait how ever minutes you need to for it to somewhat cure, its going to be depending on how hot it is. and apply about 5 more glass coats so you can sand down some without hitting fibers right away. that will be as strong if not stronger then the plastic fenders.
Looking for some smaller style tires like the r's have, just 2 back tires. pm please.