Filling garage cracks

I am prepping the garage at our new house to seal the floors.  In all the prep I have come across two areas that i need some help with.

1) The garage pad is cut into 4 sections (pretty standard I have found) and has no drain.

Should I fill the cracks with some flexible caulk and then sealer over it?  The car will be parked in there overnight and with the water drips/ salt i felt this would be good preventative upgrading

2) Where the floor meets the poured part of the wall there is a seam/crack around the perimeter.  Should this get filled in with some Quickcrete flexible caulk (I forget the product name)? Again, its another seam that can cause water to get into nasty places.

Thoughts? Input?

Thanks all

When I was younger and had more energy I sealed that crack between the floor and wall in my basement thinking it will keep spiders out.  Probably was a waste of my time.  

Generally, if your filler is flexible you should add it after the coating. Otherwise the coating cracks and peels away when the filler flexes.

I would recommend a polyurethane sealant.  It will stay flexible, some are self leveling, others require tooling.  In commercial/industrial applications I have always caulked the cracks first then coated on top, but that is with compatible products that are engineered to work together, the stuff you get at the big boxes are probably a different story.  Either way you will need to check compatibility and tape off the joint, it's really painful to remove it from areas you don't want it to stick.  I used a self leveling product to seal the joint between a concrete patio and the brick on my house, it was pretty easy to use, but mine was going to be covered by a new deck, so being neat and clean wasn't a priority.

Call Mr. Phil McCracken?