3M 4000 Marine Adhesive
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If you're installing thru-hull fittings for your new ballast system, or you need to seal the connection between two threaded fittings, 3M 4000 Marine Adhesive is the ideal product. Fast curing (dries completely in just 24 hours), non-corrosive (ideal for metal fitting connections) and white in color, 3M 4000 Marine Adhesive performs perfectly for years of dependable leak free use.
This is the same product used to install the thru-hull fittings and hardware at the factory when your boat was built, so do the job right when installing additional fittings for a ballast system.
One tube provides more than enough adhesive to install all of the thru-hull connectors in your boat, typically providing sealing for 18-20 fittings.3M Marine Part # 051135-05280
One of the two proper adhesives to use on thruhulls...
The two adhesives you should use for thruhulls are 3M 4000 (this one) and 3M 5200. The main difference between them is permanence: While 4000 can be removed with some effort, 5200 may as well be like welding the fitting to the hull! In my opinion everything on a boat is likely to need maintenance someday, so I don't want to make that future job any harder than necessary.
Hence my use of 3M 4000. It's absolutely watertight, rated for use below the waterline, and specifically intended for use with modern hull materials (including fiberglass) and thruhull materials. 3M is the leader in this segment of the chemical industry, and once again WakeMakers only stocks and ships the best.
Used this sealant for all the 7 new holes I drilled in the boat. Fitting are secure and no leaks
I was super scared to drill 3 holes in the bottom of my boat. I drilled and prepped holes. Applied sealant. After finishing rest of ballast system over a couple of days, we put boat into water. Was nervous. No leaks weate so ever. This stuff is awesome. It is super sealant.
It was scary drilling 3 holes in my boat, I was never going to risk using some lower quality cheap glue. All went well and no leaks. I do advise watching on line videos for some hints and tips. Use what the experts sell and recomend, can't go wrong.
Great Stuff If You Need UV Protection
If it's going to be exposed to UV rays, then this is the stuff for you (or in black). However, if not exposed to UV, and looking for permanent adhesion, then go with the 3M 5200. The tensile strength of the 5200 is even greater than that of the 4000UV. Keep in mind, if not using the fast cure version, full strength isn't reached for approx 7 days. I've used 5200 on thru-hulls and countless other items and 400UV on RV roof tops. This is the stuff you want. Again, if a permanent bond is desired (and not exposed to UV), then 5200 is the call. If you do not want a permanent bond and/or it's exposed to UV, the then 4000UV fits the bill.
3M 4000 Marine Adhesive Easy To Work With
I have used the 3M 4000 and 4200 Marine Adhesive on boats for years. I use it above and below the water line. Works great to seal thru-hull fittings under the water line but I also have used it in a pinch to patch the hull of my boat. I scraped the under side of my hull on the trailer but didn't want to waste the entire weekend waiting for my local shop to open. I put the 3M 4000 where I have exposed the fiberglass stringer and used the boat the rest of the summer before I could get it in for repair. Awesome product and very easy to work with.