on the iwata is it a w400, w300, lvlp?
that should cover the entire car in 3 pass's more then likely you do not have fan correct, just make fan as large as it will go, use around 28psi for w400 and 23 psi for w300
make 3 pass's overlapping 75% each pass over the car, basically so each part of the pattern goes over the car.
as for the burn thru, how new is it? i would use a heat gun or bake lamp and bake the edges of the burn thru for a few mins to get the solvents out as the solvents are what cause the edge mapping/wrinkling, then use a small gun or dial you iwata down and apply light coats of base using air stage on gun toi dry the light coat, you should be able to dry the light coat in 1 min or so, apply 3-4 coats, look for edge mapping, if there is some, sand base with 2000 till its gone, apply 2 light coats of base and its ready to clear, just make sure rest of car is sanded with 2000 so you can re clear,
the edge mapping has nothing to do with anything reacting, its where you opended up the clear and being so fresh it is still gassing out, as it take 30-90 days for it to completely gas out.
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