Rule number 1, Cover all windows with plastic.

If you've already tried the first step by observing what happens outside and in during a heavy rain - making sure that water is redirected away from the foundation by making sure that the gutters are working correctly, the downspouts are emptying at least 6' from the foundation, and that the soil is graded away from the foundation - and you're just looking for a quick fix, you might try plastic or fiberglass wall panels.

I used silver Sharpie to fill in scrapes in my (plastic) car bumper and it looks like nothing happened.

The proper way to do this is to put down a layer of plastic sheeting as a water barrier.

Technician in plastics, 99% was HDPE blowmolding, both bottles and automotive/industrial.

When I do use the sprayer, I normally do the ceilings first with minimal masking (generally just a sheet of plastic over the windows, don't worry about overspray on the walls since you're going to paint them anyway).

If you do have to tear out the floors , get witnesses as to the smell , get independent pictures and a report and save lots of the wood removed in a plastic bag for the court to smell .  

I always had good luck with tomcat green poison pellet blocks that come in the plastic cartridges .

Even plastic breaks, it is rare but it happens. 1.

Rigging the hinges with longer screws, toothpicks, or putting in plastic hole anchors, three common quick-fixes, would be too flimsy for my rental properties and probably yours.