I am wheelchair bound and find that the front wheels of my wheelchair get stuck sideways in the control joints in the cement floor in my garage and the sidewalk/patio outside of my garage. This isn't a problem (too much) when I am using both hands on the wheels of my wheelchair but often I am carrying something in one hand and wheeling with the other - then it is a problem.

I would like to fill the control joints with something to smooth out my ride. What is best to use? (I will want to paint over whatever I fill them in with?.