He increased the width of the intervening raw canvas strips in later works (Rose, 1961) while smoothing out the edges of the color bands. (bampfa.org)
Though he may labor over a single line for days or weeks at a time, smoothing out its edges with a palette knife or his thumb, he wanted the paintings to appear «effortless.» (christies.com)
A belt sander will also smooth out the edges perfectly — just be sure to wear some goggles! (saltnews.com)