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Jay,
I'm no expert on Por 15 but have used it to coat the inside of my doors and am in the process (today) of installing the truck restoration kit on my '73. This kit consists of about the same things you used except uses "chassis black" as the final coat.
The bubbles you describe sound just like what I see on the Por 15 website when they show the product being applied to a rusty battery tray. The finish on this piece seemed to have a less than desirable finish as compared to a freshly painted fender using normal car paint.
I think the bubbles are formed when the product enters the pits in metal.......maybe some chemical reaction occurs during the drying process that forms a bubble in the pit???? My trunk has pits in the metal even after I grinded most of the rust out. I believe the cure for this is using the epoxy filler that is applied between the first and second coat. This two part filler is applied and then sanded to a smooth finish.
I should know within the next 24 hours......as soon as the sun rises, I'll start the process........chemically treated the trunk last night and allowed it to dry overnight.
My engine is out and the next area to attack will be the engine bay. I'm hoping for a nice finish on both the trunk and engine bay prior to stuffing in the V8. Wild Bill shipped engine yesterday and this has sure got the ball rolling.
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'73 914
(Renegade V8 conversion)
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