Interior Attachments to Foam Cored Hull - Two schools of thought.

[rslifkin]

As a note on the 5200 type adhesives, 3M's documentation indicates that 4000UV bonds better to aluminum than either 4200 or 5200.

[thinwater]

Originally Posted by rslifkin

As a note on the 5200 type adhesives, 3M's documentation indicates that 4000UV bonds better to aluminum than either 4200 or 5200.

Google "4000 UV gummy gooey." It has been known to revert to goo after 3-5 years. It happened to me.



Sealants are not permanent adhesives. They can be, but they also break down with time. They are 3-7 times weaker in both tension and cohesion than MMA or epoxy. And they cure over days, not minutes to hours. I love some of them, but the wrong tool for this particular job.

[coopec43]

Originally Posted by psk125

Don't screw anything through the inner skin of a cored hull. We found this out by having a 2' x 3' section of our hull delaminate because of a cable tie that had been screwed to the inside of the hull of our J/36, under the starboard quarter berth. How could water get in there, you ask? The bundled wires were for the engine controls and gauges. Any splashes leaking in through the cockpit, any condensation or other drips, would be directed by the bunched wires directly to where the screw pierced the hull. Twenty years of this and "Voilà"! Studs with adhesive would have saved me a week's worth of cramped boat surgery.

What was the core material on your yacth? Apparently it is balsa?
If the core on my yacht was balsa no way would I pierce the inner lay-up either! (I would never have a balsa cored yacht on my mind)


3 Dec 2006 — How bad is moisture in a balsa core if there hasnt been delamination? ... We had a wet core/delam problem with our J/36.

https://forums.sailinganarchy.com/in...et-balsa-core/

[ftamburrano]

Originally Posted by GordMay

Adhesive Cable Tie Mounting Pads? ➥ https://www.fastenal.com/product/details/0719868

I have widespreadly used some adhesive cable tie mounting pads (exactly the ones shown) to keep electrical cables linked to a vertical wall. After one year some were already detached. Now most of them are detached after 3 y, without any pull , humidity or stress. Really unreliable!

[Martinini]

Originally Posted by GordMay

Adhesive Cable Tie Mounting Pads? ➥ https://www.fastenal.com/product/details/0719868

I have used these. The adhesive isn't very good and they come off after a couple of months at best. Glued them on with 5200 and they still came off. Crazy!

[jerrypeters]

Coopec43 - do you have a manufacturer or part number or something for "electrical cable PVC Channel (with snap on lids) "

[coopec43]

Originally Posted by jerrypeters

Coopec43 - do you have a manufacturer or part number or something for "electrical cable PVC Channel (with snap on lids) "

I'm sure this ducting would be available from one of your Hardware Chains (Electrical Section)


If you are worried about drilling holes in the inner lay-up of the cored hull you could use an adhesive instead.

https://www.google.com/search?q=PVC+...client=gws-wiz


https://www.graybar.com/snap-on-wiri...dth/p/88197229

[Manateeman]

Plexus.
One square inch will hold one manatee.
Mark

[PirateFoxy]

Originally Posted by Manateeman

Plexus.
One square inch will hold one manatee.
Mark

Request photos of this in testing. 🤣

[coopec43]

Originally Posted by jerrypeters

Coopec43 - do you have a manufacturer or part number or something for "electrical cable PVC Channel (with snap on lids) "

https://www.lowes.com/pd/MonoSystems...way/1000394521


https://www.lowes.com/pd/Legrand-10-...on-Kit/3136757


https://www.lowes.com/store/VA-Richmond/1037

[Bycrick]

I like the Plexus. I once tried attaching some PVC fenders with a flat side to the fiberglass hull. When both sides were properly sanded and cleaned, either the PVC would shred or the fiberglass laminate would pull apart.

[Chotu]

Are there some good spices for reasonably priced plexus? Jamestown Distributors ain’t it. Lol

[Bycrick]

Plexus isn’t cheap, but it sticks like mad and sets up quickly.