24 to 48 hours
People also ask
Do you have to sand polyurethane before applying?
Sanding the final coat of polyurethane leaves a scratched, rough finish to the polyurethane. To achieve a smooth finish, only sand between coats of polyurethane using very fine sandpaper, and leave the final coat unsanded.
What happens if you sand the final coat of polyurethane?
The finish when you sand the final coat is rough and scuffed up. The other notable part of the experiment was the durability of the polyurethane. Since the sanded final coat ate into a part of the final coat, it took away from the durability of the polyurethane.
Should Minwax polyurethane be sanded between coats?
Minwax Polyurethane should be sanded between coats. Sand with 320 grit sandpaper to get rid of any fine particles of dust that have settled on it while it was still wet. Sanding in this case not only allows for a smoother finish but can also help abrade the surface and increase inter-coat adhesion.
How do you recoat urethane without sanding?
Within 10 鈥?12 hours, you can recoat Spar urethane without sanding. Beyond 24 hours, sand with 220-320 grit paper to remove brush strokes and bubbles but not help the urethane polymers stick. When applying several coats of urethane, brush along the wood grain, spreading it into as thin a coat as possible.