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I am having a problem painting my door. Stripped it down once and painted with primer and enamel. When the temps went down to 30f the paint popped off. I am thinking of using latex because it is soft and flexes. What type if any primer should be used.
 

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Sounds like you had a surface issue causing poor adhesion.

I've never used Latex on an exterior metal door.
 

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I use water base on metal doors but they were always preprimed never had to prime. I think door manufacturers call for water base. What is popping off paint or primer? What exactly did you use?
 

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Oil specially formulated for steel, it Hass to has some Elasticity to it because the door will expand and contract with the temperatures
 

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I will second the Procryl primer, it’s an excellent metal primer, for a residential door I would finish with exterior latex paint such as Duration.
Not sure if Precat epoxy can be used out doors, I would double check that, most epoxies can not stand direct sunlight.
As you have had issues I would strip door again, lightly sand, and wash / degrease with tsp as you may have in underlying contamination issue.
 

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I also agree with Pro-Cryl Primer being an excellent metal primer but I prefer using KILZ Adhesion Latex Primer for steel doors since it bonds better with metal surfaces.
 

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I also agree with Pro-Cryl Primer being an excellent metal primer but I prefer using KILZ Adhesion Latex Primer for steel doors since it bonds better with metal surfaces.
It's your opinion that Kilz Adhesion bonds better to metal than Pro-Cryl. It's not fact though. Not by a long shot.
 
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