Hey all, new here, I’ve recently replaced a bed side wheel arch on my 1998 chevy truck that I am restoring, i am a noob at body work but willing to learn. I have blended in the repair area but the problem is, when using guide coat, I still have so lows here and there, by filling these lows, I sometimes screw up the fender lip body line which causes a whole lot more work. Any suggestions? Should I just spray some 2K surfacer and sand the works or should I keep on working the filler? When re applying the body filler due to lows, is it best to re coat the whole panel or just where the lows are?