I started by sanding the tank with 320,I grinded the dents with 180 to metal then filled them with 3M gold.I then blocked the bondo with 180 by hand around the curves,then glazed with 3M putty then hand sanded with 320.The dents were on the round corners of the tank,they came out really good but there is a very little low spot on one that I can feel but can't see.The decals were on the sides of the tank,I used 320 on a d/a only cause it wasn't gonna cut it by hand.I know better to turn a d/a on it's side to cut but the decals were on the curved parts and were really hard to cut out,I'm sure I created some low spots with the d/a but I thought primer would fill them.Turns out they must of been lower that I thoughtI think I'm doing everything in the right order just missed a few low spots,but if your saying just scuff the low spots with 180 then glaze I'll give it a try,is it ok to keep filling little by little until it's perfect?Oh by the way,I love 3M's products,but there filler and putty pin holes worse than the Evercoat shit I used.Any steps you see I'm doing wrong,please let me know,thanks for the advise.