Answer for Primers have not stopped bleed through, what's next?

Interesting responses. After using Zinsser priming products (both oil and shellac based) with little success (I too have a recurring stain bleed through), I'm convinced that the posters suggesting the use of a product that you've tried and failed with may have some financial interests in the product. I bought an 80 year old house that originally had stained interior trim that had been painted. Upon stripping the trim, I noticed that the underlying coat of paint was indeed metallic (Aluminum) paint. I had not idea the purpose for the use of that paint was to block the bleed of stain through the top coat/s. So, I'm going with the guy who grew up in his father's paint shop and his recommendation of aluminum paint.

  • By Anonymous
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Answer for Primers have not stopped bleed through, what's next?

The key here is "my house is about 30 years old" … what is happening is the resins in the original wood substrate and in the underlying varnish are bleeding thru… I have seen this and the only REAL solution albeit a messy time consuming job is to strip off everything using a good brand Paint and Varnish Remover… then proceed again with an Oil Primer, two coats… and finish coat with a EXTERIOR Oil Paint…

  • By MagicDave
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Answer for Primers have not stopped bleed through, what's next?

Sounds like a hassle. remove and replace the trim. Prime and repaint. Or paint it a darker colour.
Kevyn
finishesbykevyn.ca

  • By Anonymous
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Answer for Primers have not stopped bleed through, what's next?

I was raised in my late fathers paint store. The yellow that never goes away, is creosote, from a heater or old stove. It always comes back yellow, primers will not work. Only thing that will is aluminum paint, then prime and paint.

  • By Anonymous
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Answer for Primers have not stopped bleed through, what's next?

Two more coats of BIN

My experience with BIN shellac based primer is you need 3 coats. I spot prime all of my knots on exterior pine trim 3 times before I prime it. I have had no problems doing this. Try a second and third spot prime over the stains.

  • By Anonymous
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Answer for Primers have not stopped bleed through, what's next?

Tried your recommendation

I'm currently trying out your suggestion on a test area of one of my windows. That is where the trim is experiencing bleed through, and is darker then the trim along the floor. Results: I primed the test area, and 24 hours later applied the 1st coat of 100% acrylic exterior flat. As it was applied, it was fairly white, pretty much as it is right out of the can. Within one minute, you could see the color begin to darken. Within 5 minutes, the color completely changed to off-white. The final color so closely matches the rest of the off-white trim, it's hard to tell where I just painted. I will apply a second coat, and then a final topcoat, but I can pretty much guarantee the final result; the color of the trim will remain off-white, even though the primer, the two coats of flat acrylic, and top coat are bright white. Bottom line, the shellac primer, the oil base primer, and the two layers of flat are not stopping the bleed through. Does anyone have any other suggestions?

  • By Anonymous
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Answer for Primers have not stopped bleed through, what's next?

This is a tough question. You already tried a great primer that is known to seal stains and stop them from bleeding into the finish paint. This makes me think that something else might be happening.

Possibly what is happening is you're seeing the original color on the trim and not a true "bleed through" as with a water stain or crayon. In other words, the finish paint has very little hiding abilities.

The reason for this is that all paints and primers contain solids and it is the solids that give then hiding abilities. The problem is as a paint becomes shinier the amount of solids it contains decreases. So, a flat paint covers the best and a full gloss the worst. Add to this, the color bright white has little or no added tint.

It's possible the trim needed another coat or two. When you primed with the shellac primer you added back some yellow to the surface, all primers are a off white color.

The only way to test this theory is to repaint a piece of trim. This time use a 100% acrylic exterior flat after priming, exterior flat covers the best.

Apply 2 coats, in your chosen color, and then apply a coat of acrylic finish paint in your favorite sheen. Allow each coat to dry for 4 hours before proceeding with the next.

If this works then all should be well, if not then the "bleed through" should return within 3-4 days.

  • By crowderpainting
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