zoothorn

Wood water stain: painting.

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Hi chaps. Got me a pesky problem: log cabin, with bad water stain patches on inside walls from its prior site (I dismantled it/  bought it used & rebuilt it here last summer). It was in a weather prone position -before- causing the stains. Now 18 months since rebuilt, walls Im doing -are- defo dry.
 

So I thought, paint inside white to hide old stains. Cream overcoat maybe. Done one coat waterbased primer, but old water stains leaching through like muddy marks all over. Urgh. Looks awful, worse than before! Before I attack it with a 2nd coat I think best stop, ask advice.

 

Any ideas? Thanks, zooter.

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Anyone know if " Zinsser B I N" would work painting onto my water- based white primer coat?

 

https://www.screwfix.com/p/zinsser-b-i-n-shellac-based-primer-sealer-1ltr/29661?tc=ZB6&ds_kid=92700052136101425&ds_rl=1243321&ds_rl=1241687&ds_rl=1245250&ds_rl=1245250&gclid=Cj0KCQiA-qGNBhD3ARIsAO_o7yl5PHVPdnr1qHXtAB7ASGPjpnRLBwpuy5KttRzHKK9O4oFkH88QT5MaAm_MEALw_wcB&gclsrc=aw.ds

 

It is shellac based, but if folks use it often for ceiling stains (youtube clip shows, & glowing screwfix comments etc) , surely that's applying it onto water-based emulsion.. which I think mine effectively is. Only difference being a plasterboard ceiling, to my knotty pine cabin walls.

 

Thanks, zoot.

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1 hour ago, zoothorn said:

Anyone know if " Zinsser B I N" would work painting onto my water- based white primer coat?

I've used it over various paints, no doubt including some that were acrylics, so I would expect it to be fine.

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18 minutes ago, Mike said:

I've used it over various paints, no doubt including some that were acrylics, so I would expect it to be fine.


Thats good to hear. Good ok I might get myself out of a pickle with this then. Ive never heard you see, or known of ' mixing' layers of one layer being solvent based, then the next water based. Or in my case vice versa.

 

Thanks Mike.

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On 02/12/2021 at 13:49, Mike said:

I've used it over various paints, no doubt including some that were acrylics, so I would expect it to be fine.


Mike I wonder if you could voice an opinion.

 

Ive used the Zinsser BIN stuff over my bad water stains, showing through like dark muddy areas after I'd primed my pine log cabin walls with a waterbased ( no nonesense ) primer. It said on tin the primer was for wood, seems to have gone on fine.. bar the muddy stains.

 

Great results with the zinsser stuff, perfect, almost all stains covered over whole 4 walls with 1x  £20 tin. So it seems even if this stuff is meths based (? clean up told is meths, inside walls smell methy) it went onto my waterbased primer just fine.

 

Now, top coat. Would you know if I can use an emulsion? I mean if my primer is waterbased, surely the topcoat would follow on better.. if it too was waterbased. I can only think therefore, of emulsion. But never known it being used on wood before.

 

Thanks, zoot.
 

 

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Good to hear your progress!

 

20 hours ago, zoothorn said:

Would you know if I can use an emulsion?

 

Yes, I've overpainted it with oils and emulsions and - provided the B I N is 100% dry (I'd give it a few days) you should be fine.

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3 hours ago, Mike said:

Good to hear your progress!

 

 

Yes, I've overpainted it with oils and emulsions and - provided the B I N is 100% dry (I'd give it a few days) you should be fine.


It was more to do with whether emulsion is suitable for wood walls.

 

So the undercoat primer, is both a waterbased general primer, & some patches of it overcoated again with zinsser. Sort of a mishmash undercoat.
 

It does tend to have wide ranging temps being an outside thin walled wood cabin, winter cold to very stuffy hot in summer. Can emulsion cope I wonder.. It'll be a heck of a job to redo it.

 

Thanks for reading, zoot.

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