Adhesive for mounting Marine Board to inside hull

[Benny67]

Hard to say if that 3M product will work long term, I've used several 3M adhesives but not that one. Frequently those types of products like smooth close fitting surfaces, they don't like to fill gaps, which when gluing to gel coat could be an issue.

It's cheap, so buy a can and do a little testing, then report back how it works.

It's not marketed to the general public. It's a industrial adhesive. If anyone is interested I can ask the /purchasing agent where we buy it.

I spec'ed it out a few years back for securing optical glass to anodized aluminum. We use it in all our optical guages with great success and longevity.

 

[Benny67]

Basically anything 3M makes for the Industrial market is top notch...I am a big fan of all their crap from those plastic abrasive pads to the adhesive tapes all of their epoxies. Whenever I am involved in a development project they are my "go to" when I need an adhesive or tape.

Of course you need to use the proper product for your application.

Call them, they have a help line.

 

[ondarvr]

I sell industrial adhesives, and carry 3M products. A product can be fantastic in one application, and barely adequate in the next. So without direct knowledge and experience bonding two different items I never say it's going too work great.

 

[Benny67]

I sell industrial adhesives, and carry 3M products. A product can be fantastic in one application, and barely adequate in the next. So without direct knowledge and experience bonding two different items I never say it's going too work great.

....I never said it would work great for his application. I said it was THE strongest epoxy I have seen,meaning, you might want to look into the product I am mentioning.

I also said give them a call.

 

[Benny67]

if it was me, I would use 3M 4950 VHB tape to secure the battery box (usually ABS) to the fllor. I would also use the 3M 4950 VHB tape to secure a tray for the fuel tank. Or you can use 3M 5200. Make the tray out of something that adhesives stick to (ABS, Fiberglass, Wood, Aluminum, etc.)

you could also make a small frame work to support them under the seat and not on the floor. that way crud wont accumulate under the tank and battery.


not much sticks to HDPE, UHMW, or any of the other Poly Ethylene plastics.

you can encapsulate it like Ondarvr stated, however you can also encapsulate wood.

This guy's advice sounds like the best....someone who knows a bit about these products.

But then again, I would give someone at 3M a call or if you are not a 3M fan, try Loctite or some other similar Company. But definitly go to Customer service and explain your situation regardless of what manufacturer you use.

 

[landlover42]

Thanks very much,

I called 3M today. They seemed very knowledgeable about the products, not just someone putting in keywords and reading scripts.

First I talked to the Marine division:

They said 5200 would not form a good enough bond with HD polyethylene to work.

They transferred me to the Industrial division:

HS 90 spray adhesive: Said this product would not work in that environment.

With HD polyethylene, some adhesive products require that the polyethylene be treated for the adhesive to work properly. The treatment is a heat/flame treatment called corona. The Lord 7542-AB product that Woodonglass suggested needed this and explained how to do it with a propane torch.

VHB tapes: Instead of 4950, for this environment, they suggested the 5900 series, which has different thicknesses, for example 5952. Does not require corona treated material. Is affordable (1.5" x 9' is $17). Downside is that polyethylene is listed in the lowest adhesion category. For example, most metals and glass provide an adhesion of surface energy (Dynes/cm) of 1100-400. Polyethylene's score is in the 33-18 category.

Two part products for a strong structural bond:

2216 and 1838: Requires corona treated material. Scotch-Weld 1838 Epoxy Adhesive, 1 quart Kit, Green is $230. 4:5 mix ratio, 60 minute work life.

DP 8005 and DP 8010: 5 and 10 minute work time. Does not require corona treated material. Requires a 10:1 mix applicator, about $65. Is very expensive, $42 for 2.37 tablespoons.

As many of you have pointed out, the problem here is polyethylene, and I should find another material where I could use cheaper adhesives and get a better bond.

thanks for your help,
fred

 

[ondarvr]

Look at the Pro Set product I listed earlier. The flame treatment isn't difficult and it bonds well. The other adhesive I talked about I'll need to get more info on, which will happen at the end of the month.

 

[Scott Danforth]

I did state nothing sticks to PE