Answers

Not sure. Sounds like maybe mold growing from the moisture of power washing being trapped under the coating. Could be sap also, but you would have seen that before the change.

I would say yes it is in the wood. Be careful with any type of poly. It can get sticky and draw dust and dirt. Can turn it black even inside.

Not a big fan of either, but Sikkens would be my choice. I believe you would have better results with a good quality latex stain.

You can typically tell what kind of wood it is by the knot structure, the grain and the density of the wood. Sometimes smell after sanding. As for what stain to get the colors you want – you will have to experiment. You can take one color of stain and… Read More »Archive-5426

It should. You may still have some smell to the wood. That stuff is nasty.

Sounds like it should be ground or sanded. It’s the only other option other than corn or glass blasting it. If you have power washed it pretty hard trying to get this off, it will need to dry a good long time before staining. 2-4 weeks depending on the weather.… Read More »Archive-5430

I would stick with the Super Deck and apply 1 or 2 more coats. This product does tend to look dry.

Not a big fan of the Olympic, but if you must use it I do not recommend putting a clear on it unless they have one design specifically to go over their product. PS Make sure you wait at least a couple of weeks before staining after power washing.

If you want to just keep the old gray wood look, apply a good heavy coat of Shell Guard borate and call it good. If you want color, then I would recommend Life Line stain from Perma Chink.

Since log homes are stained and sealed it might not be a problem, but I would ask a medical doctor on this one. There are oak, spruce, hemlock, fir, cypress and several other woods that I have seen log homes built out of.