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What brand of primer & paint? What was the temperature when it was
applied,
and while it was drying?

I've used both Tremclad and Painter's Touch made by Rust-Oleum with
their corresponding primers but have deliberately never used a
combination of both brands on the same item. Temps were 55-60 degrees
which does seem a bit low but instructions on the tins said that was
okay. Same temps for application and drying with a fairly dry
atmosphere.

To all who very kindly responded, The Painter's Touch paint says
"Recoat before one hour or after 24 hours". Which time spread would be
better in order to avoid wrinkling or would it make any difference?

Longer, especially at lower temps. By the way, I assume you're shaking the
cans VERY thoroughly, right?