What products/methods have people used to help "soak up" dampness and moisture in a basement?

House #1: 3 Bed 1 bath Rents for $700/month (needs paint and probably new carpet) House #2: 2 Bed 1 bath Rents for $400/months ( needs no major work) House #3: Large 3 Bed 1 Bath Rents for $850/month (needs no major work) Tri Plex.

I have the opportunity to purchase a $200k property with 6 units that range from $400 - $700/mo.House #1: 3 Bed 1 bath Rents for $700/month (needs paint and probably new carpet) House #2: 2 Bed 1 bath Rents for $400/months ( needs no major work) House #3: Large 3 Bed 1 Bath Rents for $850/month (needs no major work) Tri Plex.

It seems like paint and flooring can run well into the thousands in a hurry.

We use a lot of grays or paint colors with cooler tones as well-- as seen on the door in the picture below. 

most buyers here are retail buyers that will pay retail price or $0000 more  for the new wall or shiny coat of paint.  

reglazing is like paint.  

@Robert Ehrlich You forgot to add into your calculations: future vacancy (it won't alway be fully occupied), evictions /legal fees, capex (roof, painting, heating/AC, appliances to name a few). 

Most of the houses in the area are three bedroom, this is four and has been updated recently, paint, carpet, appliances, countertops, etc. 

Really, nothing sticks to silicone, including paint!