Do I need to prime my garage floor before I paint it?

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I am finishing my garage floor. There are many holes because of winter salt corrosion. I started patching the holes but need to know if priming the area before painting is necessary. I am planning to use garage floor paint. Also, should I fill in the cracks between the four slabs? All of the pictures of finished garage floors do not have lines. They are all smooth across.
q do i need to prime my garage floor before i paint it
Light gray is the patching. Shows the large crack between slabs.
  4 answers
  • Mogie Mogie on Jun 26, 2018
    The big difference between a diy and a professional job is the prep work. Most professionals devote as much or more time to prepping the floor then painting. Cement garage floors are often dirty and oily. A cleaning excellent job needs to be done. Garage floors are also often cold and very smooth making it even more difficult for paint to adhere well. So read the instructions on your garage floor paint can and follow them to the letter.
    Just like with any paint job good prep often is key to a good outcome.

  • William William on Jul 14, 2018

    You can use a concrete resurfacing compound to smooth out the floor. The lines are stress joints in case the floor moves it cracks along the lines. You can fill them. Follow the instructions on the paint/kit you use.

  • William William on Jul 15, 2018

    You can use a polymer based cement resurfacing compound to smooth out the concrete.