For the many experts here this will be a very easy question. I am hoping you could assist with a very basic question. I have primed using Killz Premium some tannin stains on a pine shed I recently painted. All the prep work including a good wood primer and the final coat has been completed. In looking at the shed recently even after the extensive preparation there are some areas where the stains are "bleading through". I strongly believe it could be from (my opinion) the poor quality of the Killz Premium (latex product) and it's ability to "block" these tannin stains. In doing some quick research I found that Zinsser makes a product, Cover Stain (oil based) that appears to be much more effective in blocking these stains permanently. Admitedly, these stains are difficult and no product may work completely. However, my belief is that anything has to be better than the junk Killz calls premium. Here is the basic question I promised. The final coat currently on is a latex and according to the product information there is no problem with applying the Cover Stain product directly over whats already there. The question, will there be any issues with applying the latex final coat over the oil based primer from Zinsser? One of their frequently asked questions seems to indicate that it's completly acceptable to NOW apply latex/oil. The belief of this being a problem according to them is "out of date information/knowledge". Any thoughts? In addition this will only be selective spot priming and not an entire 10x14 shed.

What do I need to paint a new basement concrete floor? I have heard about etching but that does not seem appropriate for a new floor. I believe that I need a primer and that an oil base paint would provide the most durable finish. Any help would be appreciated. Thank you.