Painting new plywood - what primer/sealer to use?

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AklBen

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#272888 22-Jul-2020 14:53

We got our mostly non-visible gable at the rear of our house weatherboards replaced with plywood. As it's not pre-primed what is the best sealer to use for plywood in this application?

We typically use Resene paints and they have about 6 products that may or may not suit including 1 oil based one.

What is best before painting normal water-based top coats?

mdf

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#2527197 22-Jul-2020 15:15

Resene Quickdry.

AklBen

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#2527204 22-Jul-2020 15:19

^ Yeah that was perhaps my hidden question in there that would just normal undercoat that I've been using everywhere else good enough on ply...

BlueShift

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#2527207 22-Jul-2020 15:26

What MDF said, with additional advice - do more coats. Gables are pretty exposed, the more paint you can get on there the better the weatherproofing and the longer it'll last.

edge

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#2527219 22-Jul-2020 15:43

There's even a page from Resene that suggests Quick Dry, as suggested above. "Resene suggestions for ply"

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AklBen

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#2527220 22-Jul-2020 15:46

edge:

There's even a page from Resene that suggests Quick Dry, as suggested above. "Resene suggestions for ply"

So it does, I was on the Resene website and did a search for "Ply" on their sealers/primers page and it came up with nothing.

Thanks all. That's good, one less paint to buy.

timmmay

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#2527222 22-Jul-2020 15:56

I tend to use oil based primer for things that are outdoors. Quick dry is probably fine, but oil based will probably last longer. With oil based you need to leave more drying time, 24 hours I think. Giving it plenty of time to dry is generally a good idea anyway.

Once the primer is dry do two or three coats of top coat.

I tend to use Dulux TotalPrep if I don't need oil based, or 1 step if I want oil based. Resene is fine too.

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duckDecoy

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#2527287 22-Jul-2020 16:34

If it gets a lot of sun try and go with a paint colour that has WHITE as its base. The paint on the side of our house that gets the setting sun is wrecked, rest of the house is fine. Painter said we chose a paint that didn't have a white base and hence it got too hot. Dulux lists the base for each of its colours (white = EW from memory?), I imagine you can get the same info from Resene.

neb

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#2527506 22-Jul-2020 23:05

timmmay:
I tend to use oil based primer for things that are outdoors.

Oil-based isn't the best choice for outdoors locations exposed to sun, or more generally that get a lot of temperature variation. While nothing beats the hard, durable finish of an oil-based enamel, it also means it's much more likely to crack and chip off, which a more flexible latex won't do. I use water-based to do the outside of the house, which is fibrolite and iron, because that gets subject to a lot of temperature variations.