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Steel, (primed?) garage door
SWP high gloss for sure. Also try this: Spray a tack coat on the entire door with the SWP. This is a coat that does not cover. Just a very light coat. Don't thin your material. Open the door and put any kind of heater under it. It will warm like this. Heat goes...........you guessed it, up. After tack coat dries, spray a regular wet coat and repeat. Wah Lah. Of course I live in Central CA, so let me know. I've done this in the mid 20's and I didn't see any paint rolling off onto the concrete.
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