i have the vans wingtip fairing for an rv12 and need to do a little filling to fit the strobe i am going to use. i have to fill a few areas 1/4'' deep. what is the best way? i am afraid of cracking. i have a few of the acs fillers and have used epoxy with micro bubbles. maybe a release on the fill after it is shaped and a layer of cloth? bring the areas up to contour with masking tape, then glass cloth? flox in the filler? i have thoughts but don't know what is best.