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I posted this topic on a different message board - and everyone there was like - if you are a professional, you must sand bare wood prior to priming. I have never heard or seen this practice in real life. Millglaze on interior prime trim? Come on - who the heck sands exterior wood prior to priming? I was taught to use a good quality Oil primer - that will soak into the grain, and raise it - allowing you to sand back down to a level surface. If I did anything I might use Wilbond New wood prep, but that would be the extent of what I do. I have never seen Coverstain applied directly to interior trim that failed - NEVER! It soaks right in! Sometimes it looks like you need a second coat. Now perhaps you have all these guys going over to use these new Latex Enamel undercoaters - perhaps in that case you need to do extra stages of prep - maybe there is failure and more sensitivity to 'millglaze' - although personally never seen in it either in real life. I am dumbfounded by this practice - krikes - I will never land any bids if I did this. And oh - what was the comment someone told me....even if you are slow - how long would it take to sand down a door - three minutes......well, if you only spent 3 minutes sanding a door prior to priming, you didn't get anything accomplished IMO - so why bother?
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I am using SH ProBlock interior oil primer (it's similar to Coverstain). My only fear was that if not sanded the paint won't adhere to the surface in the long run...I am still afraid something similar to mill glaze paint failure might happen
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