Just saw this and thought I would add to what's been said.
Endure or the makers, Compliant Spray Systems was bought out by General Finishes. -the same poeple who make the Arm R Seal and other finishes you find at Rockler and Woodcraft. Many members here originally bought their 2 can sampler set that consisted of a quart of sealer and a quart of Enduro for something like $35 with shipping. Since GF now owns Enduro, I called to see what the new pricing would be. I was told that the quart containers are no longer being offered and that you must buy either gallon or 5 gallon sizes. The price for a gallon is somewhere around $50 plus shipping, so the sampler sets would probably be well worth it.
As far as cure time, I have only had to wait a day or so and never had a problem with sanding. It may be that I'm doing it when it's very low humidity in the winter also.