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Why did my freshly painted steel door peel?

I recently sanded and repainted my 20 year old steel door. One week later I looked at it and noticed it had a lift spot in the paint. I took the piece of paint and peeled off about 8 inches. This was a very good quality of Latex semi gloss paint. What did I do wrong?

Pamela Bowers
Consumer - Poplarville, Mississippi
2007

Primer for Galvanized Metal
primer_for_galv

on eBay or Amazon
(affil link)

Do you know if the door was galvanized, Pamela? Galvanized metal is very difficult to paint, requiring at the very minimum a primer designed for galvanized metal.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
Ted is available for instant help
or longer-term assistance.
2007

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