LumberJocks

Sealing Knots for Painting

  • Advertise with us

« back to Finishing forum

Forum topic by JHuttIII posted 09-01-2017 08:03 PM 295 views 0 times favorited 3 replies Add to Favorites Watch
View JHuttIII's profile

JHuttIII

2 posts in 106 days


09-01-2017 08:03 PM

Recently bought our first home at the beginning of the year, and our Master bedroom needed a complete overhaul from head to toe. Everything is pretty much complete now with the exception of the trim/molding, which I removed too as it was in bad shape. I have all of the wood necessary (just using Pine), but am having difficulty finding a good method to not have any knots bleed through the paint.

When I rebuilt the closet threshold (did an expansion), I used a technique I found on YouTube by professional painters which entailed applying a couple layers of a bondo sealer over knots before priming. After about 3-4 coats of Kilz latex primer though, the knots still bled through. I was pretty shocked as I wasn’t expecting it to come through the Bondo layer.

After some further research online, what I have come up with now is to apply wood filler to the knots, then apply a couple of coats of BIN shellac primer (aerosol) before putting on my regular primer for the wood.

I rarely paint the wood I work with, so I don’t have a lot of technique down for this. Any help or guidance here would be most appreciated!


3 replies so far

View jdh122's profile

jdh122

963 posts in 2656 days


#1 posted 09-01-2017 08:41 PM

Shellac is about the only thing that works. Personally I don’t bother with a shellac-based primer, but rather put actual shellac over the knots (once they’re filled with wood filler). It dries in about 30 minutes, then use regular primer and then paint.

-- Jeremy, in the Acadian forests

View JHuttIII's profile

JHuttIII

2 posts in 106 days


#2 posted 09-01-2017 09:08 PM

Thanks for the reply. I was wondering if regular shellac or the BIN shellac primer choice would matter much. I hear a lot of people swear by the BIN stuff, but not sure if one would be better over the other.

View woodbutcherbynight's profile

woodbutcherbynight

3647 posts in 2247 days


#3 posted 09-02-2017 02:01 AM

I have taken the router to the offending knot and then glazed back over it with bondo.

-- Live to tell the stories, they sound better that way.

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com