i've tried a tent guy, it was alright. didn't spread. pretty standard procedure i think. you can buy kits at cdn tire. drill a tiny hole in the centre of the rock hit but don't go all the way through, ~1-2mm deep, then fill it with retsyn (sp?), heat it up with a heat gun to keep the retsyn flowing to fill the cracks up and make it all dissappear.
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