Adhesive to Hold Transducer Mounting Pad to Transom

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Author Topic:   Adhesive to Hold Transducer Mounting Pad to Transom

pcrussell50 posted 04-30-2013 02:37 AM ET (US)
I want to glue a pad of plywood to my transom, but not for either of the Whalers. I want to mount a skimmer-type transducer but I don't want to drill any holes in the transom. So I think I want to glue a small pad of plywood to the transom but I don't know what to use. I'm leery of epoxy because I don't want have to use power tools to take it off. I'm thinking 5200 or 4200 but this boat is in the desert and I worry about a "no cure" situation. I have some Life Caulk but I don't know if that has adhesive properties enough to hold the block of wood on the transom. What about Gorilla Glue? IIRC that is waterproof. Or something else?
-Peter
saumon posted 04-30-2013 03:13 AM ET (US)
For that application, 5200 is perfect, being strong enough but still can be removed if needed.
For the "no cure" situation in low humidity environment, simply stick a plastic film (trash bag, polythene, etc) sealed around the repair area with tape after putting a damp rag into it and let it cure for a couple of days.
jimh posted 04-30-2013 09:33 AM ET (US)
Plywood itself is a laminate in which the layers are glued together. If you glue plywood to another surface with an adhesive that is stronger than the adhesive holding the plywood layers together, you could have the plywood fracture or tear apart and leave only the first layer still adhered to the other surface. It seems reasonable that to adhere the plywood to another surface you would use an adhesive that was about as strong or possibly not quite as strong as the adhesive holding the plywood together.
Tom W Clark posted 04-30-2013 09:45 AM ET (US)
Why not just buy a SternSaver?
http://www.sternsaver.com/
pcrussell50 posted 04-30-2013 12:39 PM ET (US)
I am aware of sternsaver and that basshole is a fellow cww member and I may end up going that route. but for now, I am intentionally wanting a more shade-tree approach.
-Peter
Binkster posted 04-30-2013 06:03 PM ET (US)
(I am intentionally wanting a more shade-tree approach.)
Shade tree?? Use Duct tape.
I think a Stern Saver might be the answer. He spent alot of time finding the right adhesive. Anything you find won't be as good as his. 5200 won't stick to gelcoat in that application. I made a couple of wooden wedges and glued them to the bottom at the transom on my antique boat. I was trying to eliminate porpoising at high speed. Well, I glued them to the bottom with 5200. They stayed glued on at 45 MPH, but provided to much down force. Thought I would have a hard time removing them, Not so. Just a putty knife in the corner and they popped off clean as a whistle , no residue on the boat bottom. You can use 5200, it will work for a short time, but soon you will find that transducer bouncing in your wake. Now if you roughen up the gel coat with some 80 grit, it will work longer but I don't think you want to do that. You have to clamp Gorilla glue.
rich
dg22 posted 05-01-2013 08:55 AM ET (US)
Glad I read this post. SternSaver is a great idea.

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Author	Topic: Adhesive to Hold Transducer Mounting Pad to Transom
pcrussell50	posted 04-30-2013 02:37 AM ET (US) I want to glue a pad of plywood to my transom, but not for either of the Whalers. I want to mount a skimmer-type transducer but I don't want to drill any holes in the transom. So I think I want to glue a small pad of plywood to the transom but I don't know what to use. I'm leery of epoxy because I don't want have to use power tools to take it off. I'm thinking 5200 or 4200 but this boat is in the desert and I worry about a "no cure" situation. I have some Life Caulk but I don't know if that has adhesive properties enough to hold the block of wood on the transom. What about Gorilla Glue? IIRC that is waterproof. Or something else? -Peter
saumon	posted 04-30-2013 03:13 AM ET (US) For that application, 5200 is perfect, being strong enough but still can be removed if needed. For the "no cure" situation in low humidity environment, simply stick a plastic film (trash bag, polythene, etc) sealed around the repair area with tape after putting a damp rag into it and let it cure for a couple of days.
jimh	posted 04-30-2013 09:33 AM ET (US) Plywood itself is a laminate in which the layers are glued together. If you glue plywood to another surface with an adhesive that is stronger than the adhesive holding the plywood layers together, you could have the plywood fracture or tear apart and leave only the first layer still adhered to the other surface. It seems reasonable that to adhere the plywood to another surface you would use an adhesive that was about as strong or possibly not quite as strong as the adhesive holding the plywood together.
Tom W Clark	posted 04-30-2013 09:45 AM ET (US) Why not just buy a SternSaver? http://www.sternsaver.com/
pcrussell50	posted 04-30-2013 12:39 PM ET (US) I am aware of sternsaver and that basshole is a fellow cww member and I may end up going that route. but for now, I am intentionally wanting a more shade-tree approach. -Peter
Binkster	posted 04-30-2013 06:03 PM ET (US) (I am intentionally wanting a more shade-tree approach.) Shade tree?? Use Duct tape. I think a Stern Saver might be the answer. He spent alot of time finding the right adhesive. Anything you find won't be as good as his. 5200 won't stick to gelcoat in that application. I made a couple of wooden wedges and glued them to the bottom at the transom on my antique boat. I was trying to eliminate porpoising at high speed. Well, I glued them to the bottom with 5200. They stayed glued on at 45 MPH, but provided to much down force. Thought I would have a hard time removing them, Not so. Just a putty knife in the corner and they popped off clean as a whistle , no residue on the boat bottom. You can use 5200, it will work for a short time, but soon you will find that transducer bouncing in your wake. Now if you roughen up the gel coat with some 80 grit, it will work longer but I don't think you want to do that. You have to clamp Gorilla glue. rich
dg22	posted 05-01-2013 08:55 AM ET (US) Glad I read this post. SternSaver is a great idea.