Also, it seems that everyone can slap some vinyl floor and a coat of paint and call themselves a real estate flip mogul. 

Maybe hang a little "wet paint" sign up between coats?

Otherwise, mop with soap/water, mop with bleach/water, dry out, apply 2 or 3 coats of Kiltz, then a couple coats of transparent sealer. 

Then they treat the tub with chemicals then with color coating.

Make sure you also apply the correct number of coats, and apply coats thinly.

One coat, thick so it doesn't drip.

We patched up some holes on the side of the house, gave it a new color and coat of paint, and cleaned the yard up.

In one of my properties there are plenty of oil stains and cracks in the concrete and I would like to redo it so it looks presentable to tenants again.I've seen some repaint there garage and some do an epoxy coating.

Everything should be sealed (sometime a clear coat seal is used, so I can't really tell if it has been sealed or not), but our standard is that everything that has "alligatoring" (the heat damage that has the ridges like the back of an alligator) comes out. 

@Kevin SmithYou are not going to like my harsh opinion, but I won't sugar-coat it.