So I picked up a 73sv and 73dv during that BassPro sale and got everything wired with power and mounted where they need to be.  Now I'm at the point I need to mount the SV transducer on the back of the boat.  I bought one of those $20 mounting boards from BassPro which come with the 2 screws to put it on the boat.

My questions are:

1) What epoxy or silicon should I use to not only fill the old holes, but put around the screws I use to mount the board?

2) I would like to do a bead all around the edge of the board, should I use the same epoxy or a silicone for this?

3) (Boating newb question) I'm assuming the holes from the transducer are drilled into a hollow area in back of the boat, how do I properly fill and seal up these holes?

Any extra info that you think would be helpful please post it, never installed these before.  Also my boat is aluminum if that makes a difference.

Thanks guys!

Really happy with how everything has come out so far...

I wouldn't put sillycone in any of the screw holes.  If you're screwing it in, get some 3M 4200 marine adhesive.  NOT 5200!!!  The 4200 has the same qualities as 5200 except when you want to take the screws out you don't have to grind out the screws.  As for filling the old holes, it looks like an aluminum boat, so I would find a Epoxy Stick that hardens like JB Weld, fill the hole, sand flat and you can put a bit of expoxy resin if you like or put the old scews back in with the 4200 to seal them up.

45 minutes ago, gulfcaptain said:

I wouldn't put sillycone in any of the screw holes.  If you're screwing it in, get some 3M 4200 marine adhesive.  NOT 5200!!!  The 4200 has the same qualities as 5200 except when you want to take the screws out you don't have to grind out the screws.  As for filling the old holes, it looks like an aluminum boat, so I would find a Epoxy Stick that hardens like JB Weld, fill the hole, sand flat and you can put a bit of expoxy resin if you like or put the old scews back in with the 4200 to seal them up.

Don't think I can put the old screws back in because I'll be mounting the plate over the old holds.

I did have an idea to put the old screw back in and on the board possibly drill out just a bit of the board to get the screw heads to fit into and then cover those head with silicone before mounting the board.

Then I would use an epoxy stick, fill the holes, sand smooth, use screws and 4200 to mount the new plate and use a bit of the 4200 over where the old holes were where the plate is going.  Screw in and wipe any excess 4200 off with a bit of paint thinner and let dry for a day and you'll be good to go.