I'm replacing my split rail fence (1995 installed) with another one - made of the same material cedar - the rounded type as opposed to the rough cut. The original was not treated in any way. The original has been 'attacked' by carpenter bees and a number of posts have rotted at the base. My question - should or can I seal the new fence and posts before installing with a water seal product - would that protect it or is it a waste of time - is there something that I can use to protect it? Someone recomended I tar the posts before putting them in the ground. Any suggestions would be appreciated.