I make Nantucket Baskets and use an Oil Based Satin Polyurethane to finish them. I am having trouble with little air bubbles in my polyurethane finish on my wooden bases. I brush the polyurethane on with a plumbers brush and I brush it until there are no or very little air bubbles and then as it drys more air bubbles seem to form in the polyurethane. Then when it is dry I have all these little bumps in my finish. I am very frustrated and don’t know how to stop this from happening. You can only see the little bumps when you look at my bases in the direct light, but I would like it to be bump(air bubble) free. Can someone help me? Or is this just going to happen no matter what I do. Thanks for your suggestions!