Painting over treated softwood garage doors

[Corazones]

I had some new softwood garage doors made (as I needed a non-standard size), which came treated with two coats of Barrentine oak-tinted wood preserver. The knots are very annoying and I would like to gloss finish them in the colour of our front door. They have now been in place for seven months and I'm hoping that any undesirable oil-based carrier will have evaporated by now.

After knotting, should I use any particular primer, or just undercoat and topcoat? The makers of the treatment advise against it and suggest further coats of their same preserver - but then I suppose they would?

Many thanks for your suggestions.

 

[blup]

There is a risk the preserver will bleed through, so maybe a stain blocking primer like zinsser cover stain, but it would be easy enough to test paint a small area with a cheaper undercoat.

 

[opps]

If the knots are weeping, I can only think of two things. One is to drill/pull the knots. Alternatively, use a heat gun to make the resin really thin and then use white spirit to clean away the resin.

Or do you mean that the knots are staining the finish coat without blistering it? If yes you could spot prime with a shellac based knotting solution, or a shellac based paint such as Zinsser BIN.

As a decorator, I have never needed to paint over the Barretine that you have. It might be advisable to ask their tech desk for advice with regards to painting over it.

Contact us | Barrettine Products

www.barrettinepro.co.uk

 

[Wayners]

Zinsser BIN can be used for spot priming only outside. It don't like the cold as brittle.

I think the best to use as wiil block any problems including knots is aluminium primer.
Zinsser 123 x 2 coats
Denib with 180 grade
Get your top coats on

Other option is spot prime knots with zinsser BIN.
2 coverstains.
Denib
Zinsser 123
Get your top coats on

 

[Corazones]

Thanks for that advice. The knots are dry and flush, so no problem there. And as I said, their tech department advises against painting.

 

[opps]

Zinsser BIN can be used for spot priming only outside. It don't like the cold as brittle.

Good point, yes, it should only be used for spot priming outside.