how thick your primer is, what kind of primer , type of color and clear determine what to expect in chips.
spi epoxy........... stays flexible
ppg concept ss.......stays somewhat flexible
spi universal clear......stays flexible
since most of my work is on c1 or c2 corvettes i need a flexible surface. i'm not looking for rock hard in a finish.
do yourself a favor. sand all the front surface as much as possible. keeping in mind the thicker the fill the larger the chip. i block down to glass each time until the sealer coat of epoxy. hope this makes sense