Does anyone use clay as plugging dams?

kind?

advice?

how many times can you use it over and over?

Works just fine, and you can shape it the way you want.  No more using a larger size dam for hole that doesn't need it.  Saves plug as well since you can shape the damn the way you want it.

I've used clay and plumbers putty as well as the 'regular' dams. I'll stick with the 'regular' dams, thank you. The clay is good, press hard, get a good seat. Plumbers putty is (IMO ) a bit better, again press hard. Both take care when taking the 'dams' off and get as much as you can off before cutting the plug. I use a router and the clay/putty left will make a mess on the blade.

Both are OK, one great thing about either, you can 'mold to fit' what ever you need to. Long thin "cuts" in a ball or sizes that may cause a "regular" dam to go to the larger size, you can "cut to fit" with clay or putty.

Good luck.