Stains appearing above knots on gloss paintwork

[bricky48not]

Hi There, I've just rubbed down the paintwork where stains. were appearing on fairly new skirting board and they are on knots in the wood. The skirting was initially primed and undercoated etc, but stains are appearing. What is the best form of treatment please, before I paint again. Thanks very much

 

[Bonni]

It's because knotting fluid wasn't applied to the knots before priming and undercoating.

I suggest painting some Zinsser B-I-N over the brown stains.

https://www.screwfix.com/p/zinsser-b-i-n-shellac-based-primer-sealer-1ltr/29661

 

[footprints]

+1

 

[bricky48not]

That's Great! Many Thanks

 

[opps]

The blurb on the back of tin will tell you to wash your brushes out in meths. Don't. All it does is dilute the BIN paint. A better option is to buy some household ammonia. It is alkaline and dissolves the paint. I cut up a plastic milk bottle, pour a little ammonia in, agitate the brush and rinse in the sink. If the brush has gone hard, I leave it in the ammonia over night. Because of the smell I leave the ammonia tub outside. In the morning the ammonia has evaporated off and I am left with water and dust at the bottom of the container which can be poured down the sink.

BTW BIN is available in spray tins if that makes life easier. The nozzle does tend to clog a lot so use a cloth dipped in meths or alcohol to clean it periodically.

 

[bricky48not]

That's really useful! Many Thanks for all that

 

[Bonni]

The blurb on the back of tin will tell you to wash your brushes out in meths. Don't. All it does is dilute the BIN paint. A better option is to buy some household ammonia. It is alkaline and dissolves the paint. I cut up a plastic milk bottle, pour a little ammonia in, agitate the brush and rinse in the sink. If the brush has gone hard, I leave it in the ammonia over night. Because of the smell I leave the ammonia tub outside. In the morning the ammonia has evaporated off and I am left with water and dust at the bottom of the container which can be poured down the sink.

BTW BIN is available in spray tins if that makes life easier. The nozzle does tend to clog a lot so use a cloth dipped in meths or alcohol to clean it periodically.

What I found was after using Zinseer, I just carry on with the same brush with water based primers and undercoat without washing the brush out. Then when you're finished painting, just wash the brush out in water.

 

[bricky48not]

That's very useful to know, ta very much

 

[bricky48not]

Thanks all for the useful information. After sanding off the paint at the knot sites, I was pleasantly surprised to find that the Zinsser B-I-N paint treatment was 'white' (for some reason I expected it to be a Brown solution) and it was great to apply. Again, Many Thanks.

 

[hants jobber]

i use bleach to clean any spillage and to clean brushes out

 

[bricky48not]

Cheers for that.

 

[opps]

i use bleach to clean any spillage and to clean brushes out

Thanks for the tip. Like ammonia, bleach is alkaline, but much cheaper.