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you gotta grind it. or really sand it aggressively.
you want it to be clean and coarse.
the new resin won't stick if there's any dirt or grime on the old stuff.
i'd get some kind of grinder say 24 grit sandpaper discs on it, and really have at it. wash it good with soapy water and let it dry for a day or two.
roll/paint the resin on, then lay the mat on it while it's still wet, then roll/paint more resin on top of that.
if you want to do multiple layers, you gotta grind in between resin coats for it to really stick.
don't breath that crap in either, and cover your whole body. or you'll be itchin for days.
mike
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