Any news on your repair?
I finally used a little of the Weld-On 4 on the 16" floor tom. It had about 1 inch of one seam that had a little give to it at the edge (this is a pattern F which has *lots* of seams unlike the regular solid color Vistalites). I applied just a little of the Weld-On 4 with the applicator bottle to partially fill the seam and it worked great. It's been 24 hours and it's as solid as the rest of the seams on that drum.
The bass drum is going to be the interesting one to see if I can repair since it is in several pieces so clamping the pieces together and maintaining the correct shape will be tough.
Scott