The knife grade has a thicker consistency, similar to peanut butter. Flowing is more liquid and flows easily. The knife grade is good for filling holes over 1/8 of an inch. For smaller holes the flowing grade will penetrate better.
TIP Most polyesters have a limited shelf life. Do not keep any polyester for more than one year.
Article ID: 1153
Created: February 5, 2026
Last Updated: February 5, 2026
Author: Dev
Online URL: https://surfacecarepros.com/kb/article/what-s-the-difference-between-a-knife-grade-and-a-flowing-grade-polyester-1153.html