My problem is I never spray that poly or a skim coat of polyester putty for that matter without KNOWING that the coat WILL without a doubt be the last application of filler applied.
This is a hard lesson learned, if you spray that polyester primer and it doesn't fill the low spots, you will have a lot of work to correct it, basically starting over. If you apply a polyester putty over those low spots and sand it flat with (you know what's coming) NICE, NEW, QUALITY, SHARP
sand paper so you CUT
it flat, then apply the polyester primer you will KNOW it's the last application.