Since even the best squeegee edge will eventually change its shape (due to abrasion with the screen fabric), you’ll need to redress the edge regularly. Typically, this is accomplished by grinding the edge on a squeegee sharpener.
1. When sharpening a squeegee, observe the following guidelines:
2. Use coarse grinding tools (the lower the grit, the coarser) when you have to remove a lot of material all at once.
3. In general, remove as little material as possible using the finest grit that will cut the material (rather than melt and smear it).
4. Make sure the squeegee edge is straight and the blade’s free height is uniform along the squeegee’s entire length.
5. When printing with transparent inks or printing images that require totally uniform coverage without squeegee marks, polish the edge of the blade with a fine (400-600 grit) emery cloth.
6. When polishing the edge of the squeegee blade, try to bevel the edge for high-resolution images and round it for broad, uniform printed areas. A beveled edge provides a sharper printed image than a rounded one. However, it is easier to eliminate nicks from the squeegee edge by rounding it.
7. Always round off the ends of the squeegee on either side of the blade: sharp ends serve no useful purpose and put undue stress on the screen mesh.