New fascia board with lots of knots. I had already primed it with 2
coats of Kilz Premium, but a painter told me that it would be best to
put an oil primer on because the knots will bleed through and stain the
finish at some point in the future.
Should I go over it with oil and should I use oil on any subsequently
replaced new fascia?
But the real intent of Kilz is mildew and an oil primer will do far
better for preventing seep-thru of pine pitch.
And, I said (and was thinking) "trim" rather than just a fascia board.
But even there, I'd still make a real effort for at least 1C rather
than run-of-the mill whatever comes out of the big-box stack...
OK, I did some checking. From the Kilz web site:
To block tannin stains:
KILZ Exterior, or KILZ Premium primers
KILZ Premium primer can be used as a tannin sealer and undercoater on all
types of exterior wood. NOTE: Because of the variances in wood substrates,
even multiple coats may not stop tannin or resin stains on all wood surfaces
Even clear for interior trim to be painted gets pricy. You do have to use
some care at the big box stores though. They do have some real crap.
The issue is that the knots may show through. That's why all the
knots are primed first, then the entire piece is primed such that the
knots get two coats. What is more likely to show through is resin
pockets, although some woods (like pine) are prone to this problem.
The shellac primer is probably the best coating for this issue. Oil
paints are particularly good.
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