- Base coat resin for laminating applications
- Surface remains tacky so layers of fiberglass mat or cloth adhere to each other better during laminating
- Will not sag on vertical surfaces
- Does not require sanding between coats, or before a final coat with a polyester finishing resin
- Contains no wax
- Requires a final coat of polyester finishing resin containing wax to cure to a hard, tack-free finish
- Application: Brush or plastic spreader
- Hardener: MEKP (methyl ethyl ketone peroxide), included
- Sizes: Available in Quart and Gallon Kits
- Each Kit order includes: 1 QT size plastic mixing pot, and 1 10″ wooden stir stick
Great for wetting out fiberglass fabrics and keeping them in position during layups
Tacky is good when you’re doing fiberglass layups and need to keep building layers without having them harden up on you. TotalBoat Polyester Laminating Resin will not cure on its own in direct contact with air. It contains no wax to prevent creation of an oxygen barrier that would cause it to cure, so it stays tacky and won’t sag while you’re building up layers. Its viscosity is ideal for wetting out fiberglass mat and cloth. Apply a final coat of TotalBoat Polyester Finishing Resin (which does contain wax) that cures to a hard, tack-free finish ready for sanding, painting, or gelcoating.
Gel time depends on amount of hardener admixed
The following table indicates approximate gel times @ 70°F. Adjust the hardener level to slow down or speed up gel time. Cooler temperatures may require a higher percentage of hardener than warmer temperature conditions.
|Slow Gel Time||Medium Gel Time||Fast Gel Time|
|20 minutes or more||15-20 minutes||10 minutes|
|1 teaspoon of hardener per quart of laminating resin||2 teaspoons of hardener per quart of laminating resin||3 teaspoons of hardener per quart of laminating resin|
WARNING: This product can expose you to chemicals including styrene, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov
Frequently Asked Questions
What is the difference between polyester resin and epoxy resin?
Polyester resin is used more for fiberglass lay-up or if you’re going to finish a repair with gelcoat, as the polyester resin will bond to the gelcoat better than epoxy. Epoxy is ideal for adhesive applications because it cures fully when applied as a thin film. Epoxy resin does not shrink when cured, while polyester resin does, based on the amount of resin that’s poured. Epoxy is also not naturally UV resistant and it will not bond to polyethylene.
Do I need to sand when using laminating resin?
No, sanding is not required between coats, or before a final coat with a polyester laminating resin.
What is the shelf life of laminating resin once opened?
Shelf life is about six months to one year once it’s opened. To ensure maximum stability and to maintain optimum resin properties, resins should be stored in closed containers at temperatures below 77 degrees Fahrenheit, and away from heat sources and sunlight. It’s important to store it in a cool, dry space.
What color is the laminated finish?
It comes clear, but with an amber tint. If aesthetics are important, look for products stating crystal clear.
Can laminating resin be used for fiberglass layup on wood?
Yes, it holds very nicely. Apply a coat to the wood first. This will allow the wood to absorb some of the resin. Then apply an additional generous coat to the wood and lay your fiberglass. Apply additional resin to saturate the cloth. Use a brush to tab in any angles or radius bends.
Do I have to add wax in order for it to dry?
If a laminate or mold is constructed using three or more layers of fiberglass reinforcement, no wax is necessary as the heat generated during the cure cycle will fully set the resin. If you don’t want to add wax, you can use our TotalBoat Finishing Resin.
Does it set up tacky or dry?
It contains no wax to prevent the creation of an oxygen barrier that would cause it to cure, so it stays tacky and won’t sag while you’re building up layers. It requires a final coat of Polyester Finishing Resin containing wax to cure to a hard, tack-free finish. Alternatively, you can add a paraffin wax additive to the laminating resin before catalyzing with MEKP.
What is the working time for this product?
The gel time depends on the temperature during the time you are using it and how much hardener you use. Adjust the hardener level to slow down or speed up gel time. Cooler temperatures may require a higher percentage of hardener than warmer temperature conditions. At 70 degrees F, one teaspoon of hardener per quart of resin will give you about 20 minutes to Gel time, 2 teaspoons will give 15-20 minutes and 3 teaspoons will give about 10 minutes.