Don't use etching primer.
Use SPI epoxy.
Look at videos on the net.
I have used many, and SPI is the best . Its flexible, holds, has millage, and can use as a sealer over body work.
You can have disasters in 3 months with crappy 1 stage primer. Figure in humidity, temperature etc will affect the contraction and expansion of all finishing materials.
I bought an egg timer to make sure I wait 30 min for induction, and 30 min between coats.
In many cases you can skip high build primer on nice indented surfaces as you can put on more SPI and block it.
SPI has a Manual for their products, and tech support, AND a large forum to show and discuss issues.
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