Gumbys_Brew

Recipes 

yeah i think its just the insulation expanding from the heat.

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Future Brews- Ned Flanders brown ale
Primary- empty
Secondary- empty
Bottled- Oatmeal Stout
Keg 1-Bavarian Bock
Keg 2-EdWort's Apfelwein

MajorWoody

Recipes 

More specifically it is probably expansion of air trapped in the space between the inner and outer walls.

Might be a good idea to drill half a dozen tiny holes around the base into the cavity between the outer shell and the inner liner, to prevent the buildup pressure in that space.

Gumbys_Brew

Recipes 

now that makes even more since. don't know why i didn't think about trapped air

__________________
Future Brews- Ned Flanders brown ale
Primary- empty
Secondary- empty
Bottled- Oatmeal Stout
Keg 1-Bavarian Bock
Keg 2-EdWort's Apfelwein

AzironaZack

Recipes 

I worried about this same thing enough to decide to mash in a stainless steel kettle wrapped in a couple woolen blankets.

I called Igloo support once to ask why they don't list their coolers as being hot-liquid compatible and they said it was particularly because of issues with warping.

BSBC

Recipes 

I just got some 10 gallon Rubbermaid coolers (from Home Depot $40/each) and am worried about these coolers warping as well. For those whose coolers warped, how bad was the damage? Is it worth it to still use the round coolers or are there better coolers to mash in? Do these coolers last or will they need to be replaced after a couple years b/c of the warping?