MP&C
Member
Although we did not try the 3M products, we did both SEM and the Norton I mentioned above. To me the SEM was not as smooth, so much that I scraped it back out. Given the results of the Norton as shown above, that's now my go-to. And if your drip rail has a folded hem at the top, I would suggest a slight initial coat that you can take a body spreader to wipe it up to enclose that seam, and then add another coat after it sets to make things smooth and pretty. The U-shape cut into the spreader I show above played a large part in getting that nice look in the drip rails, but before starting make sure you have clearance to travel the entire drip rail in a dry run.. (lessons learned) Any tight spot will stop the spreader in its tracks...