Q: I see that you recommend 3 coats of polyurethane. My contractor did one coat of sealant and 2 coats of polyurethane. Is that sufficient?
A: That should be fine also.
I assume this is an oil base finish. I’ve been using Poloplaz Primero for a number of years now. They also have an oil based sealer which is polyurethane. It’s tough as nails. I’ve often done 1 coat of that and 2 Primero. If this is water based you might need a third coat. These finishes don’t have as high a percentage of urethane solids as oil based does.