Bests & Worsts Reviews from Amazon

DO NOT BUY FROM AMAZON! I keep receiving defective product- it's either old or not stored properly. I've been using 1 -2 tubes a month for 5 years- I'm very familiar with it. I keep receiving tubes that are either rock solid or extremely crumbly. If it's crumbly, it won't work right! It has no adhesion at all. Since November, about 50 - 75% of the tubes I've received have been varying degrees of defective. EDIT / UPDATE - it seems to be ok to buy from Amazon again. I started buying again from Amazon and haven't had any more issues for some time now. FWIW, Home Depot and Lowes also had defective product as well - I had to check each tube before purchasing in-store, so it was something on the manufacturers end.