I am on my 3rd kenwood rc-50mr remote in 3 years. The original one was installed by an authorized kenwood marine dealer/installer and I have just used the original holes/spot for the replacements. The first two quit working within 60 days of install. This third/current one works fine when it's dry, but intermittently when it gets wet. The install seems to be correct, with no obvious gaps for leakage. Also, the installer doesn't recommend me sealing it with any other sealant and advised me that the rubber gasket would suffice, obviously it doesn't.
I am not a big fan of the rc-50mr remote.