Water resistant soffit paint?

[ConCretin]

I have a number of exterior ceilings and soffits that I wanted to match my interior sheetrock ceilings. I used soffit board, which seems to be holding up well but the moisture is getting at the taped seams. I used durabond and hoped it would stand up better than it has. They don't get direct exposure to precipitation but they do get some moisture in certain weather conditions.

After I complete the repairs, I'd like to find a paint like product that would better protect these areas from moisture? Any thoughts?

 

[strutaeng]

Any acrylic paint is water resistant once cured, but still allow water vapor to pass through.

What is soffit board? Plywood or a composition board?

Use an alkyd paint for better moisture protection getting into the substrate. Or, oil primer and acrylic paint. The best moisture resistance is going to come from semi-gloss and high-gloss sheens. Forget about using flats or low-sheens for exteriors.

The alkyd will hold up well, provided you don't get direct sunlight, which doesn't sound like they would.

 

[ConCretin]

Thanks for the info. This is similar to the material I used.

https://www.americangypsum.com/products/exterior-soffit-gypsum-board

It seems to be holding up fine - its the taped seams that are failing.

 

[strutaeng]

I'm no expert on this subject. It looks like both materials (Durabond and soffit) are for exterior use.

This is from Durabond's Application Tips:

"Completely cover all joints, angles, beads, control joints, and fasteners.After the SHEETROCK Brand Setting-Type Joint Compound joint has dried, apply one coat of a good-quality oil or latex exterior primer.Then follow with at least one coat of a good-quality latex exterior paint."

https://www.usg.com/content/dam/USG...pounds-durabond-application-tips-en-J1780.pdf

What did you paint it with originally?

 

[naturalgas]

Check out Mad Dog Primer, I’ve used it with great results. Pricey but a good product.


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[ConCretin]

What did you paint it with originally?

To be honest, I'm not entirely sure. Trusted my painter on that one. I do know it's a Sherwin Williams exterior product - primer and 2 top coats - but it does have matte finish. Based on prior comments, I'll be applying a semi gloss next time.

Check out Mad Dog Primer, I’ve used it with great results. Pricey but a good product.

Thanks! I'll look it up.

 

[strutaeng]

Isn't Mad Dog for peeling paint and such? Similar to XIM Peel Bond, SW PrimeRx, Et al.?

Helps with adhesion and to smooth out paint chipping. I used used PrimeRx and Peel Stop on my home's exterior. It had oil paint that had been neglected 20 years. It's like painting with elmer's white glue, very thick. It seems to work well tough.

 

[engineer2]

Check out Dutch Boy MaxBond Exterior paint. I painted my shed with it and water beads up on it.