I replaced some exterior decorative trim on my front porch and, after installation, applied a coat of white primer (Glidden Gripper is the specific product) similar to Kilz. That was about a month ago and I haven't applied any top coat yet. I noticed that there is a orange-brown stain showing through in some areas that looks suspiciously like the grain pattern in the wood I installed. I applied another coat of primer (Kilz this time) but I'm beginning to worry that I may eventually see this through the top coat also. The wood I used was something the lumber yard called Arkansas Pine. It was pretty nice looking wood (almost clear) and it didn't seem to have any excessive amount of sap. Both of the primers were latex type. Any advice on the best way to block this from bleeding through?