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The surface on firedoors usually has quite a distinct grain. Sanding through the veneer to make them smooth is a possibility, they are designed to be painted after all. Normally a bit of sanding with some build up of primer and paint gives them a smooth appearance. I would try cleaning up the darker marks with ct1 multisolve or everbuild wipes (not just any wipes though, they are the only ones I use based on experience). Maybe a bit of light sanding with the grain.
The other door. Don't risk heat because the risk of cracking the glass is too high and it would be very difficult to replace. Tape the glass before you sand (150 ish grit) then use a decent primer like zinsser 123+, should be able to put anything else on top of that.
Airhead
owl
Two simple questions about two different doors. I've sort of asked about this previously, but I lost my nerve to actually start it so thought I'd just double check. Have put in a ply fire door, the plan is to clean - sand - osmo it. My concern is if I go at it with decreasing grades of sandpaper, is there any risk I go through the veneer or lose the detail of the veneer graining that's currently there? Also, what's the best product to clean off the black-ish marks on the door at the moment? I think possibly a bit oily so assuming something chemical but maybe just sand them off?
Then I picked up a fluted glass wooden door for the bathroom. Really this just wants a new coat of paint, but my question is can I just sand it to give the surface a 'key' for a new coat of paint or would I get a significantly better finish taking a heat gun to it (carefully, around the glass) and bringing it back to wood, or close thereto?