From Behr's website, specifically the decorative topcoat instructions
How Do I Prepare The Surface?
Allow to dry completely according to label instructions.
Wipe all surfaces being topcoated with a damp cloth to remove any dirt or
On previously stained wood surfaces, where the surface topcoat is in good
condition, thoroughly clean with a heavy duty industrial cleaner or wax
remover. Allow to dry then sand with fine grit sandpaper. DO NOT USE STEEL
WOOL. Wipe with a damp cloth
bullet one seems to indicate that you're gonna have to wait a week to apply
From the same website but this time from the Sandwash instructions
If applying in high traffic or high moisture areas, use BEHR CRYSTAL CLEAR
WATER-BASED POLYURETHANE. Apply this product after the SANDWASH finish has
cured 7 days. This will darken the tone and/or color of the SANDWASH finish.
That pretty much sounds like your answer right there.