Ding All polyester sanding resin with catalyst for surfboard repairs, 8 Oz, non-tacky fast-curing

Ding All Polyester Sanding Resin with included catalyst is a clear, non-tacky polyester repair resin formulated for smooth hot coats and dependable ding repairs on surfboards.

If you rebuild, repair or finish foam-core surfboards, this 8 oz container supplies Silmar 250A polyester sanding resin plus the liquid catalyst you need to make it cure. The formula dries smooth, sands easily, resists yellowing and was developed for board builders and repair technicians who want a predictable cure and a finish that accepts subsequent coats. Typical cure time is fast at warm room temperatures: a gel phase in 6–10 minutes and hardening within about 45–60 minutes at 77°F when mixed with the supplied catalyst.

How will this resin perform on a fresh ding repair?

Use this sanding resin to fill and seal dinged areas before final finishing. It bonds to polyester-compatible laminates, levels well, and produces a non-tacky surface that’s easy to sand and feather into the surrounding laminate.

• Contains Silmar 250A polyester sanding resin used by professionals
• Comes with liquid catalyst for consistent cure timing
• Non-yellowing and UV-stable for longer lasting clarity
• Waxed formulation makes sanding and layering straightforward

What is the best way to mix and cure the resin for reliable results?

Measure and add the supplied catalyst according to recommended ratios for small repairs, mix thoroughly, and work within the resin’s working time. Keep ambient temperature near 77°F for the listed cure times; cooler conditions extend cure, while warmer conditions speed it up.

• Stir resin and catalyst evenly to avoid soft spots
• Allow 6–10 minutes to reach gel stage, expect hardness in 45–60 minutes at 77°F
• Sanded surface accepts additional coats when needed

Will this resin sand smoothly and accept additional layers?

The product is formulated specifically to produce a smooth, non-tacky surface that sands cleanly, making it easy to feather edges and prepare for topcoats. Its added wax facilitates sanding between hot coats and helps subsequent layers adhere when properly prepared.

• Waxed for easier sanding and finishing
• Non-tacky feel speeds sanding and reduces clogging of abrasives
• Sands to a smooth surface for painting or polishing

Is this a professional-grade product and what sizes are available?

Ding All sanding resin is the original polyester sanding resin used widely across the surfboard industry and is favored by many board builders. It’s offered in multiple sizes to match job scale, with this listing for the convenient 8 oz container intended for spot repairs and small projects.

• Used by a majority of US board builders
• Available in 8 oz, quart and gallon sizes
• Made in the USA and supplied with catalyst

Who is this for: Ding All Polyester Sanding Resin is suited to surfboard shapers, repair technicians, DIY surfers and hobbyists who need a reliable polyester sanding resin for hot coats and ding repairs. If you want a clear, UV-stable resin that cures predictably with supplied catalyst and sands to a smooth finish, the 8 oz size is convenient for isolated repairs and testing before larger jobs.