I left some RV antifreeze in it the first year we had it and it warped the seal a little. I was told it should and should not make a difference. I left it dry the next winterizing and it warped again, just a little. When I would take it out of winterization and let water sit in the bowl it would stop leaking.
I have been told that Oatey plumbing silicone is the best to use. I have been using that for the past few seasons and it works better, no warping. The silicone is a thick liquid so it's easy to apply.
Rich & Yvonne
2006 Safari SE -Dora-
2004 4Runner SE
Most of us don't know exactly what we want, but we're pretty sure we don't have it. -Alfred E. Neuman