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I am adding my Lowrance Structure Scan Transducer to the rear of my skiff. The transducer is already bolted to a 6061 T6 aluminum plate the is form fitted perfectly to my hull. Now all I have to do is tape, glue or bond the aluminum plate to my high density polyethylene hulls, without bolts, screws, or modifying the hulls in any way. I wanna stick it and forget it.

Anyone have any experience attaching dissimilar materials to hdpe, so my transducer does not pop off every time a gator wraps a line around it?

Quickest answer is that pretty much nothing sticks to HDPE. That's what high density polyethylene it was designed for, and why it is used for buckets/barrels/etc. Mechanical fasteners are the very best solution, especially if you expect a gator to wrap a line around it.

There are some epoxies that claim to work. West Systems has a product called G-Flex (instructions here), but the couple of times I tried it on hdpe kayaks it only sorta worked.
 

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One question, did you flame treat your HDPE first?

I guess I will be doing some experimenting myself, I bought:
J-B Weld 50133 Plastic Bonder Structural Adhesive
J-B Weld 8272 MarineWeld Marine Epoxy
J-B Weld 8277 WaterWeld Underwater Epoxy Putty
Marine Tex Marine Rapid Set

If and when these fail, I am laser cutting a mechanical mount that bypasses the HDPE hulls altogether.

I have tried heat treating/roughing as mentioned by others and just straight 'roughing with sandpaper' then gluing with a bunch of different adhesives - gave up and learned to plastic weld hdpe and use through fastening when needed. I only mentioned the West System product because a few other people have said they had success - I would not consider my attempts with it successful.

My experience is with HDPE kayaks, by the way. I don't believe that is a radically different "HDPE" than any other.
 

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If I could find a solvent that melts HDPE together, rather than just adhere, I could easily switch to HDPE plates instead of aluminum.

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Hope I did the quote right...

The answer is heat vs. a solvent, I believe. If you are trying to bond large areas you will have to have specialized equipment, I think (if it's possible). As an amateur repairing/fabricating, I have done a lot of small scale "plastic welding", but not tried more than essentially edge welding pieces to repair large holes, essentially spackling cracks, and some minor fabrication of plastic sheet from HDPE scrap to make parts.
 
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