Cuprinol has been off the market for years. I believe it was an oil emulsified water based stain. This may be a good substitute:

I do not believe a deck cleaner will hurt the TWP but I would ask the manufacturer to make sure. Stay away from deck cleaners that have bleach.

I would look at another Flood Solid stain to ensure proper adhesion.

Use the cleaning kit on all the wood. It will prep the old wood and the new. It is not possible to match old wood to new. The newer wood will stain a ...

Stain pads are better IMO. Not a big fan of rollers. You can pick stain pads up locally. Typically made by Shurline and Padco.

I would not use more then 60 grit paper. I would also lightly clean the deck after to remove the sand dust. This will help the stain absorb better.

Not mineral salts but mineral spirits or paint thinner. Wipe down with rags and dispose of rags properly. Away from heat and sun!

You would need to strip off the Sikkens first before applying the TWP otherwise you would run the risk of the TWP failing. Make sure to neutralize wit...