Jim: I apologize for high-jacking your post here... I hope you don't mind... just let me know and I can easily produce a separate post for my bottom paint and zinc additions etc.
Here are a few pictures showing zinc additions to our R25.
I found that the swim step bracing material below water line were badly eroded after some 2 1/2 years in the water so I decided to better protect the metal. Zincs were placed on all the swim step tubular bracings -- to better protect metal bracing components below water line. A good bonding between the tubular braces and the zincs was established as part of the install. I've had noticed quite a few boats in the yard had these type zincs on their swim step bracing supports. This was an easy install, an easy solution and little cost.
Small stainless wire connected/bonded between trim tab and the fixed hinge to help help avoid the fixed hinge erosion. All factory installed screw bolts were replaced with larger diameter screw bolts as the factory installed bolts appeared to be eroding far to quickly just below the heads IMO. Once the factory installed screw bolt badly erodes below the head (and this was evident) the head would easily twist off when being removed meaning the remaining bolt has to be drilled out... `a stitch in time saves nine' 😉
Large zinc attached to transom. Bolted through the transom and wired to the exposed prop shaft via a brush connector, which in turn is bonded to the boat's bonding system. This should slow down the erosion of the prop shaft's zinc. One bolt (silicon bronze) is longer than the other and will carry/hold the interior wire connections. The installation was designed to make this zinc easily replaced.
Here are a few pictures showing zinc additions to our R25.
I found that the swim step bracing material below water line were badly eroded after some 2 1/2 years in the water so I decided to better protect the metal. Zincs were placed on all the swim step tubular bracings -- to better protect metal bracing components below water line. A good bonding between the tubular braces and the zincs was established as part of the install. I've had noticed quite a few boats in the yard had these type zincs on their swim step bracing supports. This was an easy install, an easy solution and little cost.
Small stainless wire connected/bonded between trim tab and the fixed hinge to help help avoid the fixed hinge erosion. All factory installed screw bolts were replaced with larger diameter screw bolts as the factory installed bolts appeared to be eroding far to quickly just below the heads IMO. Once the factory installed screw bolt badly erodes below the head (and this was evident) the head would easily twist off when being removed meaning the remaining bolt has to be drilled out... `a stitch in time saves nine' 😉
Large zinc attached to transom. Bolted through the transom and wired to the exposed prop shaft via a brush connector, which in turn is bonded to the boat's bonding system. This should slow down the erosion of the prop shaft's zinc. One bolt (silicon bronze) is longer than the other and will carry/hold the interior wire connections. The installation was designed to make this zinc easily replaced.