lol, yah i belive the lfs guy, im sure hes built thousands of huge tanks with it(in his sleep). some people that work at a lfs just work there, you need to find a guy that lives it... its like going to any store, like home depot's electrical section, do you ask the 20 year old that works after school or the 80 yearold about wireing... i guess that realy depends on the answer of either, the 80 year old migh have just pooped his pants where the 20 yearold is in his 3rd year electrical apprenticeship... some people just bull****e there way through life and others make mistakes and learn from them. im sure that the perfecto stuff might work for a tank your size but if the tube says that its for small tanks then you sould maybe use something else, i have used the all glass stuff on my 90(as well as 2 smaller tanks and fixing one other 120) and its working like a charm, 4 years going on 34... but i also used the GE I on my buddies 150(and one other 20), and like was mentioned it looks, smells, speads, dries and holds the same as the allglass, its the same product.
the perfecto stuff was probably the only stuff he had and thought he could make a quick sale.(in a way im a sale;s guy too i know what its like, only i try and save ppl money.)