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Having installed some new wood trim in my house, I'd like to seal the knots before painting, so the natural resin doesn't start to show through after a few weeks.

I'm a transplanted Brit living in the US, so I tried searching for "knotting solution" as it is known back in the motherland. However, this just brings up all the UK supplier websites. I'd prefer not to spend $30 shipping on a product that itself is priced less than that. I can't seem to figure out what the same product is called on this side of the Atlantic though. Any ideas?

Some paints/primers claim to be up to the task, but I have tried in the past with Kilz on other similar projects and found that it only delays the resin, doesn't stop it completely. Would really prefer to find a product dedicated to solving this specific, commonly encountered issue.

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    We really need a page of UK/US translations. Things like this crop up a lot ;)
    – Tetsujin
    Commented Dec 16, 2023 at 14:57
  • What species of wood are you using? What kind and colour of paint are you intending to use? Where in the US is this? Commented Dec 16, 2023 at 15:43
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    Once again, two peoples separated by a common language, eh, @Tetsujin? :D
    – FreeMan
    Commented Dec 16, 2023 at 16:43
  • Jim - some kind of pine, looking to get a glossy white finish, in Ohio. Would prefer not to stink up the house with oil-based paint, but I don't mind treating just the knots with something oil-based.
    – CactusCake
    Commented Dec 16, 2023 at 20:55
  • @Tetsujin worth a tag?
    – nitsua60
    Commented Dec 17, 2023 at 3:03

1 Answer 1

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You want a knot blocking wood primer. Supposedly a few coats of shellac-based stain blocker, e.g. Zinsser BIN, will do the trick.

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    In support for this, I found a document on Rustin's (a UK wood finish producer) and they say their knotting solution is "pure shellac and alcohol" Commented Dec 16, 2023 at 15:12
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    Yup. Shellac or "shellac based primer" will both work.
    – Ecnerwal
    Commented Dec 16, 2023 at 16:25
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    You're not blocking the knot, you're blocking the tannins in the knot from leeching.
    – matt.
    Commented Dec 16, 2023 at 16:31
  • I'll give it a shot!
    – CactusCake
    Commented Dec 16, 2023 at 20:56
  • @matt. I'm only using the terminology from manufacturers of such products.
    – Huesmann
    Commented Dec 17, 2023 at 13:19

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