I have tried the "submerge the plastic bag in hot water" vac seal method, it works ok, but I find that the vacuum dissipates next day with the sandwich bags I use (this would probably work well with plastic bags that are made specifically for vacuum sealing).
and since the Saran wrapped cobs (even really tightly wrapped cobs) are still partially permeable, don't keep the sealed cobs in a damp, humid environment as this could mean the difference between developing mold or not. The danger period is a about a week ~ 3 weeks after the 24 hours heat when the cobs are sealed in wrap and kept at room temps. So monitor the cobs during this time and if they feel wetter than very slightly damp, then allow the cobs to air dry for a few hours in a mid ~ low humidity room, then reseal when the exterior of the cobs are not cold/damp to touch.
I got mold only once out of about 20 cobs I've made over the past few years, it developed a a very light, patchy covering of white mold on the exterior. This was during a really humid few weeks and that cob was too wet before sealing and I didn't check on it. I wiped the mold off with a damp cloth then dried it and re-sealed it.
Also note that my cobs are rolled very tightly and in a month become very heavy, hard and dense like wood or closer to hash than bud (although when sliced off can be finger rubbed then made into a perfect slow burning joint. I think that very loosely rolled cobs would have too much surface area which would make matters worse if mold developed. With a very tightly rolled cob, the cob is a solid mass and mold won't develop inside the cob, if it does then appear on the exterior then it can be removed easily but a loosely compacted cob that develops mold would be a throw-away.
I hope all this talk of mold doesn't scare people (without a vac sealer) from trying cobbing as it can be done. so long as you follow the suggestions in this thread and create the right conditions, temps, dampness levels, duration and monitor the cobs through each stage then you will be Cobbing!
Last edited by HaHaHashish; 10-19-2018 at 02:58 AM..