Need a trolling motor backer plate - Pensacola Fishing Forum

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Old 01-18-2020, 06:58 AM   #1
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Default Need a trolling motor backer plate

I’m installing a QD mount for my trolling motor. When I removed the motor from its permanent deck mount, the under deck backing plate fell apart because of rot.

A buddy suggested replacing the backer with 3/4 marine grade ply that I coat in resin to seal it up, or an aluminum plate.

Any better suggestions? Or are those my two best options?
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Old 01-18-2020, 08:01 AM   #2
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Aluminum, you won't have to worry about crushing wood while torquing mounting bolts.
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Old 01-18-2020, 11:02 AM   #3
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Resign alone will not seal Marine grade plywood.


Standard Marine grade plywood is Fir plywood. Fir will Check. This opens it's pores. Just resign coating it will still do it. Add a light layer of cloth and it will not do it.


Yes I experimented with it....years ago.
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Old 01-26-2020, 08:12 AM   #4
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I ended up getting a 1/4Ē thick piece of SS plate.

Now I just have to repair the old mount holes before I can remount the trolling motor in its new spot.
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Old 01-26-2020, 09:52 AM   #5
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I suggest you invest in some Cobolt drill bits to drill that Stainless.
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Old 01-26-2020, 10:00 AM   #6
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I suggest you invest in some Cobolt drill bits to drill that Stainless.
Already have some for the drill press.
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Old 01-26-2020, 10:32 AM   #7
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Lot of weight with stainless and some will rust. 5052 Aluminum would do the job and weigh less.
Pictured my Dive platform been in and out of water for 25 years plus spent weeks submerged in salt water on the bottom of USS Lexington as a cofferdam 5052 Aluminum. The black is 1 in foam neoprene contact cemented on the plate.
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Old 01-26-2020, 10:42 AM   #8
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Lot of weight with stainless and some will rust. 5052 Aluminum would do the job and weigh less.
Pictured my Dive platform been in and out of water for 25 years plus spent weeks submerged in salt water on the bottom of USS Lexington as a cofferdam 5052 Aluminum. The black is 1 in foam neoprene contact cemented on the plate.
It’s 304 so the carbon content wall cause it to rust a bit. I couldn’t find a pre-cut piece of 316.
As for the weight, I’m only using a 6”x6” piece so the weight will be negligible.
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Old 01-26-2020, 06:03 PM   #9
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