XLD Posted May 26, 2022 Report Share Posted May 26, 2022 Is it necessary to scuff the first coat of red oxide down before applying a second coat if it’s a week old (rain stopped me from putting the second coat on after a couple of days) Crown Trade Red Oxide Primer. Link to comment Share on other sites More sharing options...
beerbeerbeerbeerbeer Posted May 26, 2022 Report Share Posted May 26, 2022 2 hours ago, XLD said: Is it necessary to scuff the first coat of red oxide down before applying a second coat if it’s a week old (rain stopped me from putting the second coat on after a couple of days) Crown Trade Red Oxide Primer. Snap, same here. Painting the top. Im going to scratch the red down a bit before adding anymore paint. Mainly to get rid of the bits that settled in the paint. I was by trees on a windy day. It won’t do any harm to know you’ve keyed the surface again, it’s easy enough. It’s surprising how quick you can work over a large surface with a block of wood wrapped in sandpaper Link to comment Share on other sites More sharing options...
dmr Posted May 26, 2022 Report Share Posted May 26, 2022 As its a red oxide primer (not a red oxide coloured topcoat 😀) then its fine as it already a matt surface. Its really the gloss paints that need keying. Some/most primers are quite soft so you might go right through in places if you sand too hard. Some/most primers are not 100% waterproof so as its rained make sure its really dry before you put more coats on.....wait for a sunny day Link to comment Share on other sites More sharing options...
Tracy D'arth Posted May 26, 2022 Report Share Posted May 26, 2022 Scotpad will abrade the surface without risking going through. Link to comment Share on other sites More sharing options...
Stroudwater1 Posted May 26, 2022 Report Share Posted May 26, 2022 Snap, but ours is Raddler red topcoat applied 6 years ago, its got horribly oxidised over the last year so kneeling on it gives red knees. Scrubbed x3 and its better though not brilliant. There is no rust other than the odd bubble in a few places. Theres not much non slip surface left relatively either It doesnt need stripping off really though appreciate its perfection if it were. Would sugar soap then keying thoroughly do, then another topcoat some years after the last, or would an undercoat first be better? Link to comment Share on other sites More sharing options...
dmr Posted May 26, 2022 Report Share Posted May 26, 2022 I have overcoated raddle without problems, I wash first but do not bother to sand...but do use the rough side of a kitchen washing up sponge for the cleaning. Link to comment Share on other sites More sharing options...
Opener Posted May 27, 2022 Report Share Posted May 27, 2022 I've said the same elsewhere recently - be aware that all red oxide paints are not the same in terms of performance. I ran out of RO half way along the roof a few years ago. Bought and applied a second brand. Within a year patches of the second area started to, what I can only describe as 'drop off', while the original remained secure. Link to comment Share on other sites More sharing options...
Tracy D'arth Posted May 27, 2022 Report Share Posted May 27, 2022 How about Bondaprimer instead? It has a resin base and is supposed to be impervious. Link to comment Share on other sites More sharing options...
dmr Posted May 27, 2022 Report Share Posted May 27, 2022 1 hour ago, Tracy D'arth said: How about Bondaprimer instead? It has a resin base and is supposed to be impervious. As the forum knows, I love BondaPrimer and have used it for almost all of my adult life. Like all paints its not quite what it used to be and tends to go lumpy if not used for a while. This can be partly but not totally fixed with a bit of cellulose thinners and a good stir. Otherwise its still good stuff. A few times I've needed to sand off some Bonda and it almost leaves a red stain on the steel so it must be sinking in 😀 Link to comment Share on other sites More sharing options...
Feeby100 Posted May 27, 2022 Report Share Posted May 27, 2022 I steer clear of red oxide as not a great key hold in my opinion Link to comment Share on other sites More sharing options...
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