If you are planning on spraying more specialized coatings like epoxies, block fillers, or textured coatings, you will need a bigger machine that can handle the workload.  

Wear a nice sport coat and dress up do you don't look like a homeless person or a guy from a real estate club. 

Sounds like high maintenance.Explain that you can an enamel coated tub, likely every other rental also has an enamel coated tub, and they can watch what products they are using, chose to shower instead, or if those options don't work for them, you can let them out of their lease.I would not have offered to reglaze a tub that was in good condition.

I think many of use need to hear it as it is more than we realize and not in a sugar coated way.

Skim coat the horrible textured wall.   

I have a couple pairs of insulated pliers that just have a coating on the handle.

There’s thin click together stuff (decent, and cheap) or thicker fibreglass reinforced stuff (basically a forever floor).

At the beginning of RE investing you're going to work your *** off, no easy way to sugar coat it.

Hi Sinan,Have you thought about asking a concrete skim coat contractor if he could solve the problem by making the skim a little higher at one end?

The ducting by the air intake in one apartment literally has brown, yellowish sticky muck coating it.