What primer should I use before painting interior fire doors?

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I have stripped my interior fire doors using Nitromos and have sanded them as best I could. Some parts of the door aren’t as smooth as others. Will a primer smooth this out?

2 Responses

  1. Use an enamel undercoating. This type of primer is heavy bodied and designed to be sanded for a smooth finish. If you can't find this type of primer, use a fast drying oil base primer. Apply one heavy coat or 2 thin coats of the enamel undercoating or 2 thin coats of the oil base primer.

    The idea is to sand off one of the coats to a smooth surface. The regular oil base primer will take time to fully dry and be sandable. The enamel undercoating dries quickly, 2 coats can be applied in one day and be sanded the next day.

  2. Use an enamel undercoating. This type of primer is heavy bodied and designed to be sanded for a smooth finish. If you can't find this type of primer, use a fast drying oil base primer. Apply one heavy coat or 2 thin coats of the enamel undercoating or 2 thin coats of the oil base primer.

    The idea is to sand off one of the coats to a smooth surface. The regular oil base primer will take time to fully dry and be sandable. The enamel undercoating dries quickly, 2 coats can be applied in one day and be sanded the next day.

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