Seam sealer fail - help

I like 3M EZ Sand 05887 . It sands easily if you didn't apply it as smoothly as you wanted. Many of the two part seam sealers sand like a rock if you have to go back and correct something. And the self leveling seam sealers can be difficult to work with as the surface becomes vertical. 3M™ EZ Sand Multi Purpose Repair Material | 3M United States