I am currently fabbing a center console for my truck and am almost done glassing it. My uncle told me that instead of using bondo to smooth it out I could use vinyl spackle/ spackling gum, the kind that you put on a wall to smooth out dents and holes. He said he uses them on his RC airplanes and they go over 140mph in the air and has never had a problem with the stuff breaking/cracking after prime/paint/clear. Would that stuff work??? because it would be a WHOLE lot easier to use and much less of a hassle. Anybody worked with it before on a glassed enclosure?