Id stay away from the resin made by Bondo. If you can find a fiberglass supply place, you can get the good stuff for 1/2 the price. It is like hot syrup compared to cold syrup. Goes right through the mat and is much more steady on curing times. That stuff is brown/green. If you find a thin one that smells different and is a pink color, youre good to go. If you find a supply shop, it will save you a ton of money and make your work not only look much better, but save you a bunch of headaches. Night and day difference.