What is polyester?
Polyester is a type of resin that is often used as a matrix material in fibreglass-reinforced plastic products. This resin helps to bind the fibreglass strands together, giving the structure strength and durability.
Polyester resins are popular due to their good mechanical properties and resistance to corrosion, making them ideal for many applications, including boat hulls, car parts, water tanks, and building materials. In addition, polyester is relatively cheap compared to epoxy, for example.
Find polyester for fibreglass at Biltema
Biltema offers a good range for your needs. No matter if you are taking on a small or large project, Biltema has the right amount of polyester. We offer everything from 0.5 kg tubs to as much as 10 kg for larger tasks.
We also have hardeners, which are necessary for the polyester or gelcoat to cure correctly. If you are looking for cloths that can be used to remove dust and sanding residue before painting, you will also find them at Biltema.
How to use polyester on a damaged area
Biltema’s polyester adheres well to wood, metal, concrete and other materials and is vibration-resistant. Polyester should be mixed with 2% hardener and solidifies in about 30 minutes at room temperature if mixed correctly. Please note that hardeners are sold separately.
To apply polyester to minor or major damage, start by thoroughly cleaning the area of dirt, oil, and loose particles. Sand the damaged area lightly to ensure good adhesion. Apply your polyester blend to the area using a brush or spatula, making sure to cover the entire area evenly. Then place a fibreglass mat on top and dab with the brush so that the mat makes good contact with the polyester. If necessary, apply several layers of fibreglass mats on top and apply extra polyester.
Should I choose polyester or epoxy?
When it comes to choosing between polyester and epoxy for repairs or construction, there are some significant differences to consider. Polyester resin is generally less expensive and cures faster than epoxy, which can be beneficial in projects restricted by time and budget. It is also easy to work with and has good mechanical properties as well as resistance to corrosion, making it ideal for many applications, such as boat hulls and car parts.
Epoxy, on the other hand, is known for its superior strength and durability. It bonds better to a wide range of materials, including wood, metal, and concrete, and is more resistant to moisture and chemicals than polyester. This makes epoxy a better choice for projects that require higher strength and a longer service life, such as structures that will be exposed to harsher environments or heavier loads.
The choice between polyester and epoxy thus depends on the specific requirements of the project. Polyester is a good choice for quick, budget-friendly repairs, while epoxy is better suited for projects that require maximum strength, durability, and chemical resistance. By assessing these factors, you can make the best choice for your project.
Explore more boat care products at Biltema
In addition to a good selection of polyester and hardeners for repairing fibreglass surfaces, Biltema also offers a wide range of other boat care products. Our range includes high-quality boat paint to ensure that your boat’s surface remains protected and looks great for a long time. In addition, you will also find good products for filling and sealing, which are essential for maintaining your boat’s durability and preventing water damage. These products are carefully selected to ensure that you have everything you need to keep your boat in top condition – all at Biltema.
FAQs
How much polyester do I need?
As a rule of thumb, you should expect to use 1 kg of polyester per m2 of fibreglass mat.
This will ensure that the fibreglass mats are adequately covered so that they can harden properly. Note that the temperature also dictates how long it takes to harden and how good the result will be.
How do I store polyester and hardener correctly?
It is important to store both polyester and hardener in a cool, dry area our of direct sunlight. Make sure the lids are tightly closed to prevent hardening and deterioration of the product. Do not store near naked flames or heat sources.
What should I do if the polyester mixture does not cure as expected?
If the polyester mixture does not cure properly, it may be due to an incorrect ratio of polyester and hardener, significant temperature fluctuation, or that the product is too old. Check the mixing ratio, room temperature, and product expiration date and adjust if necessary.
