Yes, with the plastic you can basically side the MDF plug out and then the plastic peels right out after that. Using the plastic you have to use epoxy resin... polyester will eat that plastic up. If you were dead set on using polyester you could wrap the MDF plug in wax paper. That would work out fine.
I bring up the epoxy and polyester because some people prefer to work with one of the other. For this task, if I had to do it agian, I'd probably use polyester. Its alot cheaper. You can install it to the hull/liner with epoxy and take advantage of the strength that epoxy has to offer at those unions.
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