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Stu,For me I only want the seal outside. While sealing it inside and out may be better as far as keeping water out of the boat, that is not my major concern. If you do it right, on the outside, it is sealed. If you get water inside, you know you have a leak. If you do this little operation inside and out, it is possible to get a leak on the outside that is sealed up from coming in. And where does this water go. Into the core. I can sort of see how this could work, if you slathered a bunch of caulk on there, and then pushed it back up into the hole. I didn't check the C34 site to see if that is what they implied. But basically I want to know if there is a leak at the deck, so I can take care of it, before it gets into the core. Best way to do this is to allow it to come inside where you can see it. I only do mine outside. Slide the plate up, clean it up real good, and use a good caulk. I put the plate back down, with the caulk still damp, so it squeezes up around the inside of the plate. Then screw it down. Any excess that comes out I clean up and done. Have never ever had a leak problem doing it this way.