I asked a local locksmith and he recommended "Tri-Flow" spray, so I bought a can from him, used it on the cylinder, and it worked fine after that.The lever knobs have the usual two long screws that clamp the inside and outside half of the knob to the door.  

Basically all he did was replace two parts of dry wall and spray texture over all the seams, so there are large obvious seems of more popcorn texture, NOTHING was scraped, nothing was skimmed, and the only painting was over the texture that was added.

Around Disney World area i've seen $200 bucks, they just come do a walk through, spray for pest and replace light bulbs.

I ended up having spray foam done in my attic and injection foam into my walls.

You will need to cut into the ceiling to spray into the area.  

Second you have 7-10K spread here that you are trying to determine how to spend, what about taking what you're planning on spending for insulation and getting sprayed in closed cell foam.

You spray starch on the walls.

I used a spray on epoxy once that I was disappointed in.

Then for the shower grout, I bought Rejuvenate grout cleaning spray and a grout brush at HD; worked wonders.

Between the high humidity and we do a sealer spray, there is less chance of the concrete drying out too fast and cracking.