I’m fond of using hot glue, though my wife is more fond of using tape. We’ve had VERY mixed results with tape, though. In general, we’re using double-sided carpet tape, which has been recommended numerous times. It’s super sticky, which is great for thicker boards. We haven’t had a lot of success using it with thinner boards and plywood because of how sticky it is. The other issue is that we can’t find a good basic double-sided tape to use. Of the ones we’ve tried and seen recommended, I find that it doesn’t hold well enough, and boards will get whipped around the waste board. As a woodturner myself, this is something that is actually preventing me from wanting to use double-sided tape for securing bowl blanks to waste blocks as I see a lot of woodturners do because I’m afraid it will send a bowl flying across the shop!