I would not suse the Butyl caulk to hold down the mesh tape. also the Butyl does inhibit the ZAvlar from drying a bit. first coat took a 2 weeks before it was dry over the Butyl. the other coats cured alot faster. if I used the seam tape I would bot have used the Butyl on the corners. be sure to seal up your Zavlar immedietly or it will be useless the next time you open it up. as for why my glass broke lets call it a roomates error. he moved it over and set it on a rock. it cracked the glass. pissed me off but hey life sucks sometimes. now I have to buy a new piece and this tank wasn't planned to be pretty it was more of an experiment I was planning to try some stuff with. now I have to make it nice. I guess I have created myself alot more work. if I'm happy with it and once I have it filled I will likely skin it out with 1.4" oak and trim that out. it needs to be a showpiece now because I won't have the money to build another for a while now that I wrecked the glass. oh well life goes on.