Unless you don't want the plate to lift again you would be better off getting the right o ring for it an then just putting a brick on top of it to stop it from moving when the pump stops.
The Dragonfly Pulse surface skimmer
Just put your hang in it and get all of the stuff out of it.
Silicone is best for that.
CRC Silicone is the best type of silicone for rubik's cube
The best method for effectively removing silicone using a silicone remover solvent is to apply the solvent directly to the silicone, let it sit for a few minutes to soften the silicone, and then use a scraper or cloth to wipe away the softened silicone. Repeat the process as needed until the silicone is completely removed.
The best method for effectively removing silicone using a silicone solvent remover is to apply the remover directly to the silicone, allowing it to sit for the recommended amount of time, and then using a scraper or cloth to wipe away the softened silicone. Repeat the process as needed until the silicone is completely removed.
The best solvent for removing silicone caulk is mineral spirits or isopropyl alcohol.
It all depends on you. Silicone are the most popular.
Vina-Strip Seal For Garage Doors works great.
Is the skimmer plastic? Does it have a black bottom? If so, there is a kit for this. Check out black bottom skimmer repair - search.
sillicon
Epoxy or silicone will both work.