it is waterproof but all the gaps are not caulked and sealed typically around the edges or where the vinyl clicks together itself so water can seep between the floor and the subfloor. 

Use a GOOD primer to really seal that in before you repaint.

Has anyone had any success with the aeroseal product that supposedely seals all the holes in the duct work and makes it 40% more effecient?

If you are using financing or HM, they will schedule it right away, but the seller is probably just wanting a cash offer and wants to seal up the mortgage contingency before wasting the time.

Often times, going and visiting a company in person is what seals the deal either in favor or against.  

On the lot is their main residence, a 3/2, and on the back of the lot is a duplex with carports underneath.I would've sealed the deal today, but!

But of course for running a rental property, it's really not smart to cover up exterior trim with that flimsy vinyl-covered aluminum glued in and "sealed" with a thin bead of whatever caulk they use.

I purchased a property in Southern CA I plan house hack.So the obvious choice is to seal off the walls and just create a "studio."

It requires sealing to keep it from deteriorating.

The engineering effort is being done for under $20k and it include all signatures and seals as required for city approval.