I heard about this from a Tupperware representative. I just heated hot water. I took very tight lids and immersed ONLY the RIMS in hot water in an upright position for a few seconds and then put the lid back on the container. Let them dry in a container. It was easier for them to put the lids on the containers after I did it with a 4 liter...2Qt was very tight. Covers difficult to attach. I've dunked the lids in hot water a few times once. They were much easier to put on. Simply leave the lids on the container until cool. It works, just not for too long, just a few seconds on the edge. Note: I didn't submerge the part that protrudes onto the rim. The part you take to open containers.
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