i use ale pail inside bottling bucket (Zapap) for MLT and don't have any problems with warping. it's not the greatest at retaining heat, tho... needs insulation.
"It's all beer, it's all good." - Words of House Grog
"I'm only happy when I'm suffocating yeast" - Rob Grog
"Homer no function beer well without" - Homer Simpson
drinking: Sweetpea's Mock Maibock, BigHair Belgian Pale Ale, O'Rob's Irish Red, Rob's 50th SMaSH ESB, Feet & Ass Mild - bottle conditioning: CLB's Red Barley Wine - primary: DB 8 Point IPA Clone - on deck: Belgian Pale Ale