How many rattle cans will I need of AlmaHyde II to get complete coverage on an upper, lower and front rail?

I want to make sure I get enough but don't want to have a lot extra.

Is there another option that's as durable and as easy to apply?

All helpful input is welcome.

Thanks in advance

Fc2

Just one but extra nozzles.

I painted the upper and lower below with Alumahyde 2 as well as another lower and have a half can left, easily enough left to do another upper and lower. The reason I painted two lowers is that it did not stick to the raw 80%, even after soda blasting. It did stick to the anodized upper so I did another 80% that was anodized and it turned out well. I followed the Brownell,s video directions to a T including several (4) light coatings less than 30 minutes apart with heat gun in between each one and then three weeks  to dry.

Brownells Application Video

Yep, one is plenty.  And +1,000 on the nozzles.  One of the best things I ever bought from Brownells is the small bag of nozzles.  I love the AlumaHyde II.  In addition to the receivers, I've painted metal mounts, EOTechs and plastic stocks as well with it, with great results.

which nozzles do you use?

I bought the 12-pack of this, with the red tip.  They also work on my cans of Dupli-Color high heat ceramic paint I also use.  I know there's a way to clean the nozzlles after you use them to keep them from clogging, but I don't do that.  If the can has been sitting around for awhile, I just replace with a new nozzle before i use it.