Hi @John JacksonWriting a book, want me to mail you a printer cartridge in Texas?

There isn't going to be any real ventilation in the bathroom, so you should wear a paint respirator with organic vapor cartridges as you put this on.Once you've got it spot primed, break out setting-type joint compound.

I am into retro cartridge video games and cleaning contacts on circuit cards is the number one reason cartridges don't work.

The Complete reigns supreme as the stinkmaster world champion but the fumes are so bad that even if you wear a respirator with organic vapor cartridges it will attack your eyes.If you're paying contractor prices to get this done sight unseen in KY or NC, rip out all the hardwoods, roll the Kilz Max all over the subfloor (they'll refuse to use the Complete, and probably gripe about the Max), and do the luxury vinyl plank thing.

Then they have to call a plumber to replace a cartridge because they didn't run water in a faucet for 6-9 months.

I replace shower cartridges too. 

I do SFR only, as my rents are about 70-80% of a worn out duplex at the same price, tenant feel more at home, stay longer, and take better care of the places in general, I know thats not always the case, but by and large, thats been my experience, Rehb then with the least CapEx going forward, make them warm welcoming and reduce the stuff that is likely to break, for example, I pull any fans and put in new light fixtures, with LED Bulbs, I use Luxury Vinyl flooring throughout (no carpet) I replace faucets, and mixer valves(at least cartridges) and replace toilets, or at minimum fill valves and flappers, we also put in new switches and receptacles, we never do fridges with water and Ice, my tenants love their homes, they are clean fresh and comfortable. 

That means, usually, N95 paper resirator dust masks (you get them cheap in bulk on Amazon) and a standard half-face painter's respirator with removable cartridges.

He did contact me before fixing it and mentioned that eventually I would need to have the cartridge in the master tub repaired because there was a significant leak. 

Worn flapper or fill valve in toilet, replacing a faucet cartridge, replacing CH/A filters, change fluorescent ballast, adjust screen doors and windows, flush hot water tank, replace faulty breakers, replace a circulation fan in a refridgerator, replace agitator dogs in a washer, change heating element or ignitor in an electric or gas clothes dryer, lubricating a ceiling fan, replace a p trap under any sink, replace any wind blown shingles, change any thermocouple in a gas appliance, do simple 110v flux core welding, do pvc/copper/pex/galv. plumbing, etc.If you don't know how to do those things yourself, someone else is going to make money off of you.