Six Grit Sizes: P80, P120, P150, P180, P320, and P600 Explained

What Do the Six Grit Sizes Mean?

Each sanding grit serves a specific stage in the resin finishing process:

• P80 & P120: These coarse grits are ideal for rapid material removal and shaping rough resin edges.
• P150 & P180: Used for refining the surface after initial shaping, these grits smooth out deeper scratches left by coarser paper.
• P320 & P600: Finer grits that help remove minor imperfections and prepare the surface for that final polished look or the next stage of finishing.

How To Choose and Use Sanding Grits for Resin

Start with a coarser grit like P80 or P120 if your project has noticeable flaws or hard edges. Progressively move to finer grits, always sanding in even strokes and ensuring you clear away dust between changes. Switching to P320 or P600 for the last passes sets the groundwork for a clear, blemish-free finish.

For convenience, consider using a sanding disc kit like the Dry Sanding Discs Kit 150mm featuring all six key grits tailored for resin work.

When the Right Grit Order Matters

Following the appropriate sequence of sanding grits is particularly important on larger resin pieces or when aiming for a transparent, glossy result. Skipping a step may leave scratches or cloudiness, while using all six grits in order helps produce smoother, clearer outcomes.