3MMarine Adhesive Sealant Fast Cure 4200 (06560) – Semi-Permanent Flexible Adhesive Sealant for Boats and RVs, White, Flexible Bonds, Underwater-Safe, 295 mL Cartridge

This sealant is excellent. Cure time gives plenty of work time while fast enough to get back on the water quickly. Being in a tube makes easy to dispense and spread. It stands up to weather and vibration great. The adhesion is great and has held strong not had a single drop of water get by. Cleanup is easy if you do it right away. Great value in sealants.

I have used this product before and it is great. One thing that drives me crazy is when you order these and they are over 18 months past the expiration date, the one I got was well within that, so I was happy. I use the 4200 if I think I may have to remove the item in the future, if I never want it to come lose I use the 5200.

This product is very popular among boaters as it has been tested and proven over the years.Before ordering, you should be aware that 3M makes this, the 4200, as a sealant that can eventually be removed if needed. They also make 5200 which is intended to bond permanently, as in prepare to be destructive if you need to undo the bond.So, with that said, think of 4200 as a super high quality marine version of bathroom caulk/adhesive sealant. With that in mind, use it for all leaks and repairs with the knowledge that if you ever have to "undo" anything, you can. And keep the 5200 in mind when you really, really, really want to bond something for life.4200 is obviously more expensive than traditional bathroom caulks, but you are paying for 3M's years of testing and research, as well as years of testing in the field by boaters around the world. This product has a great, well-earned reputation as a no-nonsense sealant. I bought a tube to fix a leak on the flybridge of my boat, and of course once applied, my leak is no more. Just be sure to clean the area well, with acetone, before applying (as you should with any sealant).

4200 is some great stuff. Nice because it's not permanent but still seals great. The bottom of the 10oz tube has a metal opener on it. Basically, it looks like the top of a grease gun. They do this to provide a better seal on the bottom of the tube so the product doesn't get ruined while sitting. Remove the tab and the bottom has a plunger for a standard caulking gun application. I wanted to put this here because I was confused by the seal, so hope it will help others.

Any 3M product I've use including this is great. Amazons pricing and availability not so much. Large price swings every few days / weeks and same day, next day, 2 day and next week options come up randomly. I'm sure as always they have an explanation as to why that the lawyers have written. Not to mention the tubes that came in envelopes were dented beyond use and a missing applicator tip on one. But when delivered dent free for 22 bucks its great.

Very good

I read most of the reviews on the 3M Fast Cure 4200 Sealant and was a little warry but after using the product, I am very pleased. Yes, it is not an easy flow product out of the included nozzle but it has to be designed that way or you would have material all over the place. I suggest as others have, do not try to have to small of a hole in the nozzle because it is difficult when using a smaller hole. I kept tightening the nozzle after each hole I filled on my boat and had no problems with it. The product skinned over quickly and cured totally within 24 hours. I suggest everyone, read the directions so they are not trying to use the product for an application it was not designed for. Great product and will use again if the need arises. Wish there was one size smaller because once it is opened, in 24 hours, it can no longer be used. I was filling small screw holes where I removed snap grommets in the floor of my boat and wanted to protect the area the screws had created. Sealed great and permanent till I want to pull it out or put screws back in.

I'd love to see a better squeeze tube design. This stuff works great but it gets expensive. I hate opening a new tube for a small project because there is no guarantee the contents won't go "solid" between now and the next use. I've all but given up on the 3M 5200 because of it's Viper Grip. I'm using the 4200 as a sealant and not really as an adhesive and prefer it over other knock-offs. Yes, the 3M is more expensive but it seems to work better and hold up longer.