Silmar® 250A Polyester Sanding Resin (Hot-Coat)

2026-03-13T02:02:20-07:00

Type: Sanding Polyester Resin
Price: 16.00 - 195.00 (4 variants)

Finish your board with the professional’s choice: Silmar® 250A Polyester Sanding Resin. Manufactured in Hawthorne, California since 1961, Silmar is the undisputed leader in resin quality, providing the crystal-clear, durable finish that defines high-end surfboards.

Commonly referred to as "Hot-Coat" resin, Silmar 250A is pre-formulated with a surfacing agent (wax). Unlike laminating resin, it is designed to cure hard and tack-free, allowing you to sand the surface to a smooth, professional finish without gumming up your sandpaper. It is the go-to choice for final coats and most ding repair applications.

Product Details:

Pint or Quart: Includes 0.5 oz MEKP hardener.

Gallon or Pail: Does not include MEKP (sold separately).

Primary Use: Perfect for hot-coats, glosscoats, and structural ding repairs.

Shelf Life: Guaranteed 1-year minimum shelf life.

MEKP Usage Chart

Proper catalyst ratios are essential for a clean, sandable cure. Refer to the chart below for the ideal mixture based on your working temperature.

Pro Tip: Ensure your room temperature is stable. If it's too cold, the wax may not rise to the surface properly, leaving "sticky spots" that are difficult to sand.