Im thinking about making up a smaller 5 gallon mash tun for small experimental batches. I can probably build one up for under 30$ thats why im even contemplating doing it. Yay or nay? I have a 70qt. coleman xtreme, and i think it'd be a little overkill for a 2-3 gallon batch, side question, anyone know what i can use to seal the 70qt. around the lid? Possibly silicone of some sort? It seems i get about 4 degrees of heat loss over an hour mash.