FIBERLAM Plus 1-10G Polyester Fiberglass Resin - Extended Tack Time

Our review of the FIBERLAM Plus 1-10G Polyester Resin finds it best suited for DIY boat, RV and automotive fiberglass work where a longer working window is needed. This resin is a marine-grade, low viscosity polyester laminating resin supplied with MEKP hardener and formulated to stay tacky longer so layers can be positioned and stacked more easily. The single biggest reason to buy is the combination of professional-grade cure behavior and included catalyst bottles, which saves trips for separate hardener purchases and simplifies small-to-large projects.

Key Features

• Marine Grade Quality: The resin is described as GRADE A and intended for marine and RV manufacturers, giving confidence for structural repairs and new builds.
• Included MEKP Hardener: Each gallon ships with a 2oz bottle of MEKP, so users have the correct catalyst on hand for immediate mixing and curing.
• Extended Tack Time: The formula offers longer tackiness, which helps when stacking multiple layers of mat, biaxial or cloth without early skinning.
• Low Viscosity Coating: Low viscosity allows excellent wet-out of fiberglass and coring materials, making hand layups and spray application easier.
• Cures Tack Free Without Wax: The ortho-type polyester cures fully in 24-36 hours without wax under typical conditions, allowing subsequent lamination or gelcoat adhesion.

Who It's For

This resin is aimed at professional boatbuilders, repair shops and experienced DIYers who work on boats, kayaks, canoes, surfboards, RVs and automotive fiberglass parts and need a reliable polyester laminating resin. It is particularly useful when you want a working time that lets you position reinforcements and build up laminates without rushing.

Beginners who require very fast tack-free times or who prefer pre-measured two-part epoxy systems may want to consider other resins; temperature and correct MEKP dosing are important to reach full cure in the stated window, so some familiarity with polyester mixing and safety is helpful.

Pros & Cons

Pros

• Marine-grade quality suitable for structural fiberglass work.
• Comes with MEKP catalyst bottles matched to gallons purchased for convenience.
• Low viscosity ensures rapid wetting of cloth and mat for strong laminates.
• Extended tack time makes multi-layer layups easier to manage.

Cons

• Cure time depends on temperature and MEKP amount, so cold conditions can extend cure beyond the 24-36hr range.
• Being an ortho polyester, it lacks the chemical resistance and lower odor profile of some epoxies, so ventilation and PPE are needed.

Specifications

Our Verdict

FIBERLAM Plus is a practical choice for anyone doing marine or transportation fiberglass work who values professional-grade polyester resin and the convenience of included MEKP. It offers strong wetting, extended tack time for layered layups, and a predictable cure window when mixed and used at recommended temperatures, making it good value for builders and repairers who work in typical shop conditions.

Frequently Asked Questions

Does the resin include hardener?
Yes, it ships with a 2oz bottle of MEKP for every gallon purchased.

How long until it is tack free?
Under normal conditions it cures tack free in 24-36 hrs, but warm conditions and more MEKP can shorten that time.

Can it be used with gelcoat?
Yes, gelcoat adheres well to this polyester laminating resin and it is suitable for gelcoat-backed laminates.