I am currently renovating my house and am re-painting. The entire house has been painted in baby blue enamel on all the walls and a darker blue enamel on all the trims....(why anyone would do this I'll never know) Anyway, I was wondering what is the best undercoat to use for painting over all this enamel. Is a 3 in 1 product best, or is an acrylic undercoat / sealer all that's required. I have used taubmans 3 in 1 before and found it to be good, but it doesn't seem to cover the blue coloring all that well. Is there another product thats better???