I recently filled in some cracks in my garage floor. I used a two-part epoxy. I found the self mixed epoxy is better for surface cracks as it spreads like drywall compound. I found the first tube I bought wasteful as small cracks were hard to fill and the excess did not re-spread so easily.
I did however go back to tubes as I wanted to seal the space in my garage where the concrete floor meets the concrete walls of the surrounding foundation. It was becoming a home for any bugs that made their way under the automatic garage door. I couldn't master a corner palate knife so tubes were sooooo much quicker and cleaner for this application.
What I used was all paintable but also already pre-colored grey which matched my garage flooring.
