Silmar® 250A Polyester Sanding Resin

Silmar® 250A Polyester Sanding Resin is the industry-standard resin used for surfboard hot coats and surfboard ding repair applications. Formulated with surfacing agent already added, Silmar 250A cures with a hard, sandable finish that is ideal for creating a smooth surface prior to final sanding and polishing.

Known for its excellent sanding characteristics, clarity, and consistent cure, Silmar 250A has been trusted by professional surfboard builders and repair specialists for decades.

Manufactured in Hawthorne, California since 1961, Silmar resins have earned a reputation as some of the highest-quality polyester resins available to the surfboard industry.

Features

• Premium polyester sanding resin for surfboard construction and repair
• Ideal for surfboard hot coats and ding repairs
• Contains surfacing agent for a hard, sandable cure
• Sands easily for a smooth finish
• Excellent clarity and consistent performance
• Trusted by professional surfboard builders for decades
• Manufactured in California since 1961

Available Sizes

Includes MEKP Catalyst
• Pint – Includes 0.5 oz MEKP catalyst
• Quart – Includes 0.5 oz MEKP catalyst

MEKP Not Included
• Gallon
• Pail

MEKP Catalyst Information

MEKP catalyst (hardener) is required for curing polyester resin and may need to be purchased separately depending on the size selected. Please refer to the MEKP Usage Chart for recommended catalyst ratios based on temperature and working conditions.

Shelf Life

Minimum shelf life: 1 year when stored properly.