I have always used BIN (shellac) to prime the knots then used oil-based exterior primer on all 4 sides of my exterior White Pine Trim and siding; then finish coat with good-quality latex.
But now, I'm noticing that most of the exterior primers are now water-based. Do you think these latex exterior primers are any good?
> I have always used BIN (shellac) to prime the knots then used oil-based exterior primer on all 4 sides of my exterior White Pine Trim and siding; then finish coat with good-quality latex.
>
> But now, I'm noticing that most of the exterior primers are now water-based. Do you think these latex exterior primers are any good?
Yes, I have used latex exterior over wood and BIN with no known problems. Latex paint is a lot better for the environment. You can dump left over latex paint at the land fill, but oil based paint has to go to the hazardous waste site.
(disclaimer: I don't consider myself an expert on the subject)
I thought they quit making oil based paints altogether for exterior use. As for painting over pine knots, you know that pine sap/tar is going to get through any kind of paint anyhow. Yellow pine would be far worse than white pine. Yellow pine does make for better furniture however.
> I thought they quit making oil based paints altogether for exterior use. As for painting over pine knots, you know that pine sap/tar is going to get through any kind of paint anyhow. Yellow pine would be far worse than white pine. Yellow pine does make for better furniture however.
Oil Based paints are still legal, but the manufacturer's were required to reduce the VOC's.
We don't have yellow pine around here, but spot priming the knots with BIN (a shellac) always worked pretty good for eliminating bleed-thru in white pine.
