Yeah that's a old trick, I did it years ago.
It's the same principle as the Ebonite Hook Again system.
Takes little longer than a few hours, should leave it for at least a day or as long as you can.
While the warm would help, that cat litter don't warm up fast. Put the lid on the bucket to keep it from drawing in the outside moisture.
Sanding first can help also, it opens the pores up.
The tape over the holes isn't really needed, just point them down anything gets in them. Just dump it out and blow out the holes and wipe.
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