I used Guardz to prime some new wallboard because I had a lot left over from another job. I applied one coat and two coats of duration over it. The Gaurdz soaked into the spackle and left pourous looking spots that showed through the duration satin. I was disappointed with the final finish. I love guardz fur what it is but having to apply two coats would be a deal breaker for me to use again as a one coat primer. I think I would have gotten a better overall finish using PVA or just putting two coats of duration right on the wall.
Daniel, here is a quote from the directions on the Gardz can:
Apply only when air, material, and surface temperatures
are between 50-90ºF (10-32ºC) and the relative humidity
is below 85%. Thoroughly mix before using. DO NOT
THIN. Apply GARDZ liberally to the entire surface using a
brush, medium nap roller or sprayer, to ensure good
penetration. Do not over apply or the coating will sag.
GARDZ appears milky blue-white during the application
but dries water clear. Properly sealed surfaces should
have a uniform sheen. Reapply to areas that have been
missed or lack sufficient coating." (bold and italics mine)
The job is what it is. If the surface is so porous that you need a second coat of Gardz, then that is what you need to apply to make the job look right. If you know of a one coat primer that is a better sealer for new drywall and mud than Gardz, please tell us all here and help us save time, materials, labor and money.
P.S. a second coat of Gardz goes on substantially faster and easier than the first coat.
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