Yes it needs to be sprayed, but that is as much as I know about it. There are more specifics here on the board with it. As for doing it on 4 wheeler fenders? I'd be a little leary of that, again this is from not really knowing what the Silvaspray is like. I painted the fenders on my quadracer some years back, the plastic is polypropylene, and needs a special primer and a flex additive to be sprayed first then the topcoat of paint, which also needs flex additive. The stuff has held up great, way better than I thought. Matter of fact, I forgot they were even sprayed till a guy asked me the other day about it. If the silvaspray remains flexible, and gives good bite on the plastic then it may work, otherwise be a waste. If you are interested though, email me and we can work things out.
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