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gwilkrrs 10-09-2013 12:20 PM

painting knotty pine ??
 
i am close to painting on my addition, I will be painting my ceilings that are constructed out of 1x8 v groove wood. it is a pine product with knots. what is the process and materials for priming and paint so the knots won't bleed thru? I was told to shellac over the knots?

jeffnc 10-09-2013 12:28 PM

A shellac-based primer would work well over wood with knots. BIN is a very common one.

Other than shellac, the general rule of thumb is "oil blocks water, water blocks oil". In other words, use a water based primer to cover oily, greasy stains. Use an oil-based primer to cover water stains. Wood tannins are water based, and therefore should be covered with an oil-based primer, if not using shellac.

r1racer 10-09-2013 12:32 PM

You can also fill th knots with wood putty or something like mh ready patch.

KD PAINTING 10-09-2013 01:46 PM

painting knotty pine ??
 
You could also apply oil-based primer and that should prevent bleeding. Good Luck!

gwilkrrs 10-09-2013 03:24 PM

thanks. I will just use an all surface oil based primer then.
the knots are surface not actual holes..... I didn't want the extra steps of shellac

ddawg16 10-09-2013 03:49 PM

Why not stain?

I personally think knotty pine looks very good stained....especially inside....a bit more work...but looks good.

And is pretty much ageless.....

Exception being...if the general look of the room is no where near country or something similar...then paint.

jeffnc 10-09-2013 05:03 PM

The shellac isn't an "extra step". You would simply use BIN as your primer instead of an oil based primer.

gwilkrrs 10-09-2013 07:16 PM

it isn't being stained because the boss said "no". I thought we were but nope.

I misread the BIN comment, my bad, I thought it was BIN and then primer.......

Jmayspaint 10-09-2013 08:47 PM

You will have better luck with blocking the knots with shellac than oil. Oil primers like Cover Stain are the go-to for tannin bleed (knots), but I have been seeing failure with oil primers alone.
Spotting with shellac, then a full oil prime is a safer bet. But even that doesn't always hold long term with new wood.

I have been hearing that ext wood glue spread over the knots works well.

ToolSeeker 10-10-2013 09:51 AM

Another beautiful ceiling bites the dust. You could probably remove the wood sell it for enough to buy drywall. I know I would buy 1x8 t&g knotty pine.

gwilkrrs 10-10-2013 08:57 PM

another ceiling didn't bite the dust- one was just created. they are 13 foot tall cathedrals with exposed ridge beam and fake rafters at 4' o.c.

Matthewt1970 10-11-2013 11:27 PM

Quote:

Originally Posted by Jmayspaint (Post 1251647)
You will have better luck with blocking the knots with shellac than oil. Oil primers like Cover Stain are the go-to for tannin bleed (knots), but I have been seeing failure with oil primers alone.
Spotting with shellac, then a full oil prime is a safer bet. But even that doesn't always hold long term with new wood.

I have been hearing that ext wood glue spread over the knots works well.

This. When it comes to knots I have found latex primers block the tannins for a few days, oil based primer block the tannins for a few years, and shellac block the tannins for a few decades.

gwilkrrs 10-12-2013 07:08 PM

wow- sprayed the ceiling with bin today- that stuff is like water!! I sprayed all 1 ceiling instead of spot priming the knots I just did all of it- need to get more for the other ceiling............ thanks everyone


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