I have a bottle or Sorghum on my shelf which I keep as a souvenir. I bought it about 25 years ago and just never used it. It is now for all intensive purposes unusable. But... some feel that the epoxy method is messy. I've never found so. A little wax paper takes care of any epoxy drifiting off the sheeting and once spread with a spatula and excess removed (about 1/2 typically), there's really nothing to drip - the sheeting just remains wet but essentially free of glue flow.

I've yet to have a drop of epoxy fall on my "coring" table.

I admit I am curious about the GG approach though and wondering whether clamping is required. What I like about the weight approach is that it is easier to distribute the load evenly - somewhat akin to bagging.

David.