3M 7000000623 Marine Adhesive Sealant - 10 oz., White

I have all votes my whole life and this product. I have used hundreds of times and it’s always solves any issue. It’s just amazing how much more than it cost now.

Strong bond

3M 5200 may be the best product on the market for sealing boats. If the product doesn’t come undamaged you can’t use it. The product doesn’t come with an applicator tip you can’t use it. What’s wrong with Amazon in their shipping? You shipped me a product which was damaged and unusable AND NO APPLICATOR TIP! wasting my time not only can I not get my project done on time I have to get in the car and drive to the UPS store to return your product. Why did you send it to me a damaged tube in the first place with no tip, is this a joke. Maybe one of your fancy robots did it but if an employee did it, maybe they should be retrained! Thank you. Sincerely, for wasting my time. I only hope that the replacement is in usable condition with an applicator tip.

I used this adhesive to repair/reattach the keel guard on my fiberglass bass boat. It worked perfectly and the guard is still attached after a year. The adhesive is white and easy to work. I masked off the hull to keep adhesive off areas not under the keel guard. Cure time is pretty long (about a week) so give it plenty of time to cure before using. Worked great for this application.

Worked great for my boat, definitely worth the price to know it’s sealed correctly.

I would have been a lot happier if the nozzles had come with the caulk tubes.

This Marine Adhesive Sealant has good adhesion and feels strong. So far did not fell apart under water.

Folks, if you have something that needs to be waterproof and almost permanently attached, this is the stuff! I worked for years in the boat business, and this is a "can't live without it" kind of product. It sets up and cures underwater and is immediately waterproof. The adhesiveness of this product can't be over-stated; don't stick it if you plan to move the item later. I've patched seats. convertible tops, and mounted thru-hull fittings WHILE IN THE WATER. It can be removed but it won't be easy. No, its not cheap but it does exactly what it says, and the peace of mind is well worth the price.