3M Heavy-Bodied Seam Sealer, 08308, Two-Part, Self-Mixing, Automotive Epoxy, 200 ml/6.75 fl oz Cartridge , Black

Used to reseal my Land Cruiser’s rain gutters. Consistency is like honey. Self-leveling is great. 8-minute work time is optimistic; move fast. I had to go over a spot I’d missed after my initial bead had begun setting and while new stuff bonded perfectly, it did not self-level quite as nicely as I had hoped. But great product.

This is a very good seam sealer and it sets up very quickly. BUT… be ready to chase it if you try to use it on vertical surfaces. It dispenses like warm honey and is very runny for the first few minutes.

I used this for sealing drip rails on a Ranger... very pleased with the results. It does self level quickly and evenly and looks great. I used about 1/2 of the 200ml tube for both sides and probably put in quite a bit more than the factory did...but one tube would easily do both drip rails on a full size truck I think. Since it is self levelling you must dam up the ends with masking tape and make sure the surface itself is level... and plan to grind out some of it on the ends, easily done with a small file. Overnight cure is better, the data sheet says paintable within a short period but it was still a bit tacky after an hour... rock hard the next day and very easy to finish the ends.

USE SMALL SPOT IT WILL RUN BUT VERY GOOD PROUDUCT

Works great. Levels out very nicely. Super strong bond. Expensive but well worth it.

Not sure about self-leveling, was expecting something more "fluidy", the viscosity and stickiness is just like honey and as a matter of fact - as epoxy :). It's likely great glue for gluing separate pieces, but not great for filling voids, due to low viscosity and high stickiness. The nozzle with the cartridge is bulky and exponentially grows with the gun, so not great for tight spaces. The proprietary gun is another story for itself...Should have gone with a smaller package with a thumb applicator instead...

Works great and have no concerns with longevity or durability. That said make sure you’re completely ready, masked off, rags handy etc. This sets up fast and doesn’t self level. It is thick “heavy bodied” like advertised. I used this one because I had some verticals and horizontals I was worried about and they will be visible after painting. Once I laid down enough sealer spread and smoothed it with my finger. Once it was all laid down and I removed the masking tape it would not feather out from the tape line. After 5-10 minutes (when it has a skin) with a wet (spit in my case) finger this sealer is easy smoothed the rest of the way with feathered edges without tape lines. Pics are of a K5 Blazer drip rails and header area. All things considered I will definitely buy again when needed.

This product is so great that if heaven has a body shop then God must of created this! It flows out well and is self leveling. Long are the days with a seam sealer where you apply and then run a damp finger over the fresh sealer as this stuff is self leveling, strong and can be painted. Perfect for sealing drip rails and rain gutters