Priming wooden window casing

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Old 04-14-16, 09:37 AM
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Priming wooden window casing

My house is 15 years old. Basement un-finished until this year. Trying to paint the wood window casing. Put on a coat of beauti-tone Acryl-lok. Advertised as a munti surface primer. Recommended by they guy at the home hardware store. The wood casing has some water staining from previous condensation. I'm the place with the worst staining the primer is bubbling a ND cracking. I'll try to attach a pic. Sanded the wood before priming too. Any ideas.
 
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Old 04-14-16, 09:58 AM
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Water based stains generally need a solvent based primer to seal in the stain [keep it from bleeding thru the top coat]

Bubbling or cracking paint is often caused by contaminants on the substrate. While pics might change my mind, I'd probably sand with 80 grit and apply an oil base or pigmented shellac primer.
 
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Old 04-14-16, 10:14 AM
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Could a small amount of mildew in the wood be the contaminant you speak of? And I can't figure out how to attach a photo in this forum.
 
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Old 04-14-16, 10:39 AM
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The pigmented shellac primer mark referred to that you want to use to cover stains or bleeding knots is BIN primer.

http://www.zinsseruk.com/wp-content/...2/05/B-I-N.jpg

To post pictures, click on the image icon in your reply, then click either computer or url. Tell it where the photo is. It must be in .jpg format and must be small enough to upload. Big files won't be accepted.

Or just paste the link if you have uploaded your picture to a file sharing site like dropbox, photobucket, picasa, flickr, etc.
 
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Old 04-14-16, 02:36 PM
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Generally mild mildew on the wood won't cause adhesion problems although it often allows the mildew to come back sooner. Grease or silicone is a more likely culprit.
 
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Old 04-14-16, 03:22 PM
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I was using my phone and didn't see the photo icon, anyway, here is a shot of what I'm dealing with. (finger is in there just because the my stupid phone wouldn't focus on the solid white surface) Its like a bunch of tiny pin holes and some cracking. Looks like something is coming up through the primer. I got some of the BIN primer. next question, can it go on over top of what I already have done (latex primer) with the BIN, or do I need to take it all back down to bare wood?
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Old 04-14-16, 03:28 PM
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The BIN can be applied over top of your existing paint or primer BUT it would be a good idea to sand it with some 80 grit to smooth it some but mainly to remove any coating that isn't well adhered.
 
 

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