Ply to GRP?

[Allan]

I want to fix a plywood panel inside a locker to mount some new electronic stuff. I can't use screws as it's just a thin panel inside the hull. What is the best "glue"? I have some 291i open or can buy no more nails etc in the morning.
Allan

 

[Old Harry]

No nails is acrylic rubbish
Gripfix is a far better product, any good tube sealant should be ok as long as the panel is firmly held during cure time

 

[Mikedefieslife]

Tech7 will work nicely if you don't want to use epoxy.

 

[Praxinoscope]

If I want a permanent fix I usually use Isopon 40 it's a polyester resin paste with added glass strands for strength, it makes superb adhesive for ply to GRP and the ply virtually becomes a part of the structure. spread some on the reverse side press on to the GRP and within 10-15 minutes there will be a permanent bond.

 

[Poignard]

I want to fix a plywood panel inside a locker to mount some new electronic stuff. I can't use screws as it's just a thin panel inside the hull. What is the best "glue"? I have some 291i open or can buy no more nails etc in the morning.
Allan

Are you ever likely to want to remove this ply panel?

 

[Allan]

Are you ever likely to want to remove this ply panel?

No, I'm sure it will stay there as long as we have the boat.
Allan

 

[Allan]

I've just had thought, it would help if I can use something from Screwfix or Toolstation.
Allan

 

[Praxinoscope]

Not sure either screwfix or toolstaion stock Isopon resin filler, have you a Halfords nearby they definitely stock P40

 

[prv]

I'd just use the Sika you have open. My freshwater pump and shower drain pump are mounted on a plywood board that's stuck to the hull with 291. I'm sure they're heavier than your electronic stuff, and they also vibrate. Been there for years without issue.

Technically 291 is only a sealant, not an adhesive, but as anyone who's had to remove the stuff well knows, it adheres pretty firmly nevertheless.

Pete

 

[Boathook]

No nails is acrylic rubbish
Gripfix is a far better product, any good tube sealant should be ok as long as the panel is firmly held during cure time

I've used no nails for sticking in place trunking with no problem. I wouldn't use use it for structural items though.

 

[alahol2]

The new Screwfix do-it-all hybrid polymer is OB1.

 

[rotrax]

I've used no nails for sticking in place trunking with no problem. I wouldn't use use it for structural items though.

I stuck five Spanish tiles to the bricks alongside the front door using no nails five years ago, three quite large ones and two end trims. For the house number.

Still there, outside in the weather, instructions said not exterior use.

But, not structural.

But, still there.............................

 

[Poignard]

No, I'm sure it will stay there as long as we have the boat.
Allan

In that case you could use epoxy or CT1.

If you wanted it to be removable you could use Velcro

 

[Allan]

Many thanks for all the help, I'm about to get 291i all over myself! I wish I could do these things without it looking like a warzone!
Allan

 

[Old Harry]

I've used no nails for sticking in place trunking with no problem. I wouldn't use use it for structural items though.

Errr this is NOT structural, is it

 

[jwilson]

I'd just use the Sika you have open. My freshwater pump and shower drain pump are mounted on a plywood board that's stuck to the hull with 291. I'm sure they're heavier than your electronic stuff, and they also vibrate. Been there for years without issue.

Technically 291 is only a sealant, not an adhesive, but as anyone who's had to remove the stuff well knows, it adheres pretty firmly nevertheless.

Pete

Sikaflex is pretty good as a glue, as PRV says. Two young workers from an expensive yacht builder's boatyard tried to remove my damaged alloy toerail sections, sikaflexed and screwed down. Fortunately and completely by chance I caught them before they had prised off more than a few areas of the patterned deck gelcoat underneath and for several inches around the toerail edges. They and the managing director of the company were then educated on how to do it very slowly cutting away the Sikaflex as they worked along instead of big crowbars and brute force and ignorance. I was promised it would all be fixed .......

The saga got worse. On Friday afternoon they knocked off work. taping over all the holes. unfortunately the tape adhered only to the hull sides, not the patterned deck surface. Over a weekend of heavy rain the 50 screw holes let gallons of water into the hull, UNDER the foam vinyl hull linings - the tape neatly channeled every single drop of rainwater through the screw holes. On Monday floorboards almost floating.

What should have been a few days work ended up with multiple dehumidifiers below for a fortnight, and then some replacement of vinyl linings. Also several goes at matching sections of diamond-pattern deck surface gelcoat, even the last "best" job still highly visible. The company builds VERY expensive yachts.

Slightly grumpy at being unable to live a normal life due to the blasted virus, which I don't have! I think your Sikaflex should be fine: clean the surfaces and maybe roughen them slightly first.

 

[salar]

I have done exactly that with Sikaflex. Painted ply over a GRP bulkhead. Carries plenty of wight no problem.