PAINTING UP-AND-OVER GARAGE DOOR:

[RONCHAM]

Hi - I'm painting a steel up-and-over garage door. I've stripped off all the paint down to metal - metal is shiny here and there but mainly dull grey. Feel a bit stupid asking but is it likely to be galvanised? If so, would sand- papering/scraping strip off the galvanising? Finally I've seen some advice to use an exotic primer, others say just use an ordinary metal primer (even on galvanised steel). Would appreciate advice please ( I generally shop at the big DIY stores so range often limited).

 

[Zampa]

Not a good idea to rub down galv as youll take off the coating thats protecting the metal

Give it a coat of zinc phosphate primer or multi purpose primer (its the same thing)

If you buy 'metal primer' check that its compatable with zinc...this is whatgalvanising solution is made of

Then two coats of gloss

 

[joe-90]

You usually need an 'etching primer' for zinc.

 

[Zampa]

only new bright zinc..if its weathered or old stuff ordinary primer should be ok

 

[RONCHAM]

Thanks for advice/suggestions.

Does this therefore mean if you want to strip off all existing paint, you're likely to lose any galvanising in the rubbing/scraping process?

If you just remove any loose paint patches, will primer/ undercoat on these patches hide them well so you get good uniform finish with top-coat?

I asked similar question on eggshell paint on walls - seems if you have any cracked areas, you have to take off the lot else cover wall with paper then paint - being basically lazy, I was hoping you could use fine-surface filler on these areas to hide them).

 

[Zampa]

You wont lose it as such..but you might damage it..if the paint is sound then leave it there..

Then prime the patches undercoat the whole door then gloss

But if you strip it all back then id go for primer and 2 gloss.

 

[RONCHAM]

Thanks again - that's exactly what I'm gonna do.