Primer Problems

[pickles]

I am repainting a dado rail white. It is made of hardwood and was originally stained (1995) a darker shade and then varnished with a clear water based varnish. I am now on the second coat of white primer and have noticed a yellow discolouration seeping through which I assume is the old stain.

Has anyone got any advice about how to stop this happening.

Thanks in advance.

 

[Zampa]

It could be old stain..or it could be resin bleeding through as its hardwood...give it a rub down and give the whole thing a coat of white knotting

 

[pickles]

It could be old stain..or it could be resin bleeding through as its hardwood...give it a rub down and give the whole thing a coat of white knotting

I have some ordinary Knotting, can I use that.

 

[Zampa]

Yep...but bear in mind it will be brown and nee more overcoating...you may also be able to use stain block

 

[Third_Eye]

Or use Aluminium Sealer................

 

[Zampa]

Thats darker still he wants to paint it white...whats the zinser one...the stain blocker?..is is the bullseye 123?

 

[Third_Eye]

If wood dye is bleeding through (as explained above) then the dye will bleed through every stain blocker. The only thing that stops wood dye is Aluminium Sealer. Personally i find Zinsser is only good for hard-to-stick surfaces and it has let me down to many times when using as an stain blocker.........................

 

[Zampa]

The only type of wood dye (not stain as a lot of people call it) I know of that bleeds is the oil based one..but this is a tricky one..

'Second coat of white primer'...hmm..why two primers pickles? are you using water based primer/undercoat?

 

[pickles]

Second coat was only because the first one discoloured. The old dye was the sort you get that smells like strong white spirits and dries fairly quickly. It had 2 coats of water based varnish and I did it 11 years ago so I can't understand what's going on.

I think I will try and get some white knotting. Is it the sort of thing you can get at B & Q etc.

 

[Zampa]

No...youl need a trade centre and ask for either white knotting or 'styptic knotting'...Leyland Jonstones do it about 9 squid a litre

As far as I know B and Q dont do it.

 

[joe-90]

I'd go for the aluminium primer personally. It is specially made for just that purpose.


joe

 

[Third_Eye]

Yep............................................

 

[Zampa]

I'd go for the aluminium primer personally. It is specially made for just that purpose.


joe

No..its specially made for priming wood...but it will seal stains I give you that.

But Pickles wil then be faced with having to give it at least two undercoats to blot out the dark grey colour of it.

 

[pickles]

Just got a very good result with 2 coats of Rustins water based white sealer/primer

 

[Third_Eye]

Hope it works for you. Though you may find that wood dye will bleed after 72 hours !