I received a piece of marketing from Third Federal Savings & Loan (www.thirdfederal.com), offering to refi our primary residence to a 10 yr fixed at 3.29%/3.39%apr with closing costs at "only $595".Given I'm currently paying 4.375%, on the surface, it looks like I could shave 6-8 months of my current note with a slightly lower payment (~$20 less), it would seem worth it to do this for the $595 expense.

If you plan to build a portfolio of MHPs, it would be good to do this legwork in advance of buying parks, so you can build a relationship with the banks that surface as the best option prior to making offers.

And that's barely scratching the surface of what you need to know to come up with a CAP and know if the deal is even worth pursuing.

Are we talking walls or surfaces or literally all over?

Surface prep and eliminating the moisture are the most important steps in the process.

That would be odd though because cement board is used as a surface for something like tile not carpet. 2.

Only 3-5% have been really bad, and it was often not who I would have expected from the surface level. 

Making it very hard to pinpoint the source or viability of the results.The costs of the remediation  is on par with what we find in our areas and is for surface treatment only. 

A decent rule of thumb to use is $20 per square foot if all you have to do is repkavr/refinish the interior surfaces and fixtures.

Hard surface flooring in high traffic areas and wet areas helps to keep turn costs down.