I think I have found a solution for this requirement. I painted the bottom sides of my new 31 running boards with my recipe for wood preservative. I used a soft 3inch brush. In so doing I discovered that after I painted the boards, I let them set up for about 30 minutes, then stippled the preservative with a the same paint brush. When dry to the touch, the texture came out very close to my NOS boards. The boards look very similar to Marco's pictures.You can get Don Turley to e-mail you my recipe for wood preservative.