“Crack filling is typically performed by cleaning the affected areas, grinding or sanding all heaving seams, and application with crack squeegees, caulking guns, or steel trowels, depending on which material is used,” says Franz Fasold of Ace Surfaces-North America of Altamonte Springs, Fla.
www.tennisindustrymag.com/articles/2006/03/fix_the_cracks.html