I was having some problems installing uniseals in my grow bed. It is a 3/8" plywood with pond liner. I found that by cutting slits into the pond liner and folding down the hole made for a tough push through. I was just about to give up and went looking for the KY Jelly. Apparently its all gone. But remembered I had coconut oil.
Once I applied coconut oil it litteraly fell through. I have two grow beds and when i did the first one about a month ago (been pretty busy) i used KY and it was still tough