I didn't know this happened but what do I know anyway. I oil primed and water-based top coated this pergola about three years ago. Everything looked great but now 3 years later as you can see there appears to be tannins weeping out of the little slots in the treated wood. Anybody else have this? I'm guessing we probably didn't get the oil based primer pushed up inside those slots enough. My plan is to top coat with an oil base instead of water-based this time, my question is should I reprime this with oil first, or go straight to oil top coat over this previous water based top coat? Thanks in advance.
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