Re: knotty pine wood primer?
There are a number of ways to go about it.
1 - Prime with one coat of Zinsser Bull's Eye 123 (blue label ), which will cover most of the knots, then spot prime as needed with either shellac, lacquer, or BIN primer (Zinsser red label ), followed by another coat of Zinsser 123, as spot priming will leave "hot" spots.
2 - Spot prime first with one of the above mentioned products, followed by two coats of Zinsser 123.
3 - BIN prime the whole thing.
If you go the route of spot priming, I would recommend using an aerosol can of matte finish lacquer, polyurethane, or BIN primer, as this will be the easiest and fastest method to apply. It will also minimize clean-up, which can be a real pain with these products if you don't know what you're doing.
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