Are you talking about mudding on wood paneling?

Employers won't tolerate certain activities that are also undesirable in tenants so you would have additional assistance in getting a problem person out.

Is that cement or stucco and mud over the bricks?

Get that money, evict them, lick your wounds and pick better quality tenants next time, and/or sell this property because it sounds like it's a very undesirable part of the market where you get poor quality tenants.

I recommended actively changing the environment around him, which he isn't the rightful owner of, to effectively make the shed an undesirable residence.

Appreciation can be $150 per door in a good market.17K properties you can buy 8, because you're price is too low for financing, it may be to low or undesirable even if a HML or private lender would dare go there. 500 in rents is 4K.

If you use 5 minute mud for a small patch, you can fix it a lot faster.

Hillsborough has some very nice areas that will command stupid prices (South Tampa) but there are more undesirable, or rural areas than nice neighborhoods in my opinion. 

About me:I started to work as a sub in 2010 hanging, tape, mud, drywall and paint for extra cash during college.

It truly is sickening, to know that people are being sold over priced, under rehabbed properties in undesirable neighborhoods to newbie investors.