An extra $200 would be well spent Ez, let them do it.
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Len- I'd have thought that you'd need to etch prime first, once the car had gone back to bare.
Perhaps Len the high build you used was did both.?
Any high build I have used is definitely 'softer'' when you sand it back because it goes on thicker, and it does dry harder as it ages and blends smoother than normal straight primer.
So I probably would have done:
-etch prime
- prime
-spot filler/stop putty
-high build primer
-guide coat
- top coats
-clear coat.
The single pack topcoat I bought recently (which is Satin Spruce but I think should have been the Wedgewood color

of Juicemans car before he went all Porsche inspired ) was a water based enamel metallic, that is self clearcoating.
It's still in the tin, but is meant to be easier to apply, and you don't polish it when finished, the gloss is as it comes off the gun.
What happened to Acrylic or Enamel, and metallic needing clearcoats?