Looks like sap try to leach out under the stain. You cannot stop it. Might want to replace the board.

Knots do not matter that much. You have to brighten after the stripping, See if that helps. If not, it would best to try a penetrating darker stain to...

Does not matter if rains after brightening. If a heavy rain, we always wait 48 hours. If a light rain and weather is warm, we wait about 24 hours.

Do you think w/ the large number of knots that I always will have issues w/ this wood unless I go w/a solid stain? I'm assuming this was the reason fo...

I took your advice and stripped using Defy. But I was unhappy w/ the amount of stain it removed. (see first pic, although next morning and still looke...

Use an airless sprayer.

Sanding the rails will be extremely difficult and will not work with a hand sander or sponge. Stain stripper will not remove this either. We would sug...