Belg, One of many options is to use A-West "Weather it" Same rules apply as stains, stain prior to glueing, wood will warp. When I use it on wood sheet, I lay the sheet on glass and weight it down. If I want some red tones I weight it with an iron weight! If not I use wax paper. If you really flood the wood it will color more quickly. Lightly brushing it will have almost no effect. This is nice because it allows you to control things. This brewery had all its wood parts stained with the weather it. Prior to painting, I applied some bits of rubber glue. After painting I rubbed the glue off to get the peeling paint effect with old wood beneath. I hope the photo is accepted this time, first try it was 69k and it was not accepted! worst part is having to type the message over.