The caulk around the windows on my commercial building were installed about 10 years ago. The caulk, a medium gray color, still looks great. It seals the aluminum framed commercial windows to the block walls.

Reason I ask is I need to cut the bottom of one of my man doors and it frame to install about a 1" tall, solid aluminum sill. Kinda like a dam to keep water out. But I want to use a commercial grade caulk. Not the Home Depot quality caulks offered to us general public. That stuff doesn't even last around a bath tub for a year

Vulkem 116 is pretty hard to beat for metal to concrete if that is what you are doing. It is a polyurethane sealant, I would imagine any of the poly caulk would be good. Contractors around here like quad...but it does not like to be immersed in water, vulkem seems better for that.

When we had our windows installed they used Dap DYNAFLEX 230 Premium Sealant (Indoor/Outdoor) ..and they guaranteed the sea for five years. I only had to call them out once for a minor leak.

you could also try, Gorilla Clear 100 Percent Silicone Sealant Caulk, I have heard good things about their product.

You can’t beat Vulkem116.

With 116 you need a decent caulking gun, not a dollar store special. Tool it with a caulk tool and have some lacquar thinner around if you want to smooth it perfect and to clean your hands.

Thanks I ordered some 116 online.

I would consider sherwin williams powerhouse siliconized sealant. Tons of colors, pro painters use it almost exclusively around here. Stop by the store and grab a tube or two to compare the different brands side by side. I prefer powerhouse in most applications.