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Sealer for painted metal door

I have a new metal garage door that was primed and painted with water based paint.  I would like to put a clear sealer as a top coat to further protect it.  I am confused what to use as a sealer.  I was thinking a water based polyurethane but am getting conflicting info whether this can be used over paint and/or on a metal door.  Thanks.
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Posted 2018-07-22T18:54:00+0000  by Mulder67 Mulder67
Assuming you painted the door with two coats of a good quality paint suitable for the purpose, then there is no need for an additional "top coat."
Posted 2018-07-22T21:52:46+0000  by Adam444
Thanks for your input, but I was not asking whether or not I needed a top coat. I am asking what to use should I wish to apply one. 
Posted 2018-07-23T15:49:22+0000  by Mulder67

Should you want to proceed with a clear coat, your best bet would be a water based, urethane spar varnish. Water based spar varnishes  have UV blockers in them. They also dry crystal clear and remain so. Spar varnished differ from interior varnishes in that the film is more elastic, to allow for the stresses of exterior temperature and humidity changes.
Posted 2018-07-26T05:06:16+0000  by ordjen
Thanks. I got a response from Behr (the brand of paint used on the door) and they said because the door is metal, polyurethane vs urethane would be recommended.  Is this a factor to consider?
Posted 2018-07-26T14:32:32+0000  by Mulder67

I bow to the experts at Behr. I am not sure of their reasoning. Metal is a far more stabil substrate than is wood, so the elasticity is not as big a factor. I would expect that either would perform well.

Posted 2018-07-27T03:32:38+0000  by ordjen
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