Abstract:The epoxy can be used to wet out chopped strands of the Fiberglass Finish Mat. The binder does not dissolve, but it gets put into suspension and is se
The epoxy can be used to wet out chopped strands of the Fiberglass Finish Mat.
The binder does not dissolve, but it gets put into suspension and is sealed in the cured epoxy. This helps the finished product retain its shape and stiffness. Unlike epoxy, a polyester-based resin can be used on gently curving projects. The difference between using epoxy and a polyester-based resin lies in the soluble binder of the fabric.
There are two types of fiberglass finish mat. The first type is available in precut lengths. The second type, 1.5 oz., adds bulk quickly. This type of mat is good for use as an initial layer in bonding repair work. It works best with epoxy resin systems, but not with polyester or epoxy resin systems, as these products break down the styrene binder and allow the fibers to become saturated.
The two most common types of fiberglass finish mat are the 1.5 oz. mat and the 3/4 oz. mat. The latter adds bulk quickly, and is ideal for the initial layer during bonding repair work. The fibers of the latter two are highly absorbent, so it is important to choose the right resin type for the job. It is best to stick with an epoxy-based product unless you're certain it'll adhere to the substrate.
The CSM requires multiple coats and may not be suitable for bare fiberglass. However, it does have the benefit of being pliable. The two types have different properties, and it's advisable to use the one that meets your needs. For example, the CSM is more flexible and can be used both above and below the waterline. The double bias non-woven is rigid and comes with a woven roving on one side and a mat on the other.
If you are looking for a lightweight yet durable finish mat, a 3/4 oz. mat will work. The 1.5 oz. mat will add bulk quickly and is ideal for the initial layer of repair work. It's important to remember that the fibers of the fiberglass mat are not compatible with epoxy or polyester resin systems. They must be saturated. A high-gloss epoxy finish mat will make the material waterproof.
For a waterproof finish, the woven mat is the ideal choice. It is thicker than fiberglass cloth and can be applied to a variety of surfaces. It's best used in boats that are above the waterline. It can also be applied to other parts of the boat. It's possible to choose between a woven or a non-woven fiberglass mat. The woven fibers are thinner than those used by polyester.
The Fiberglass Finish Mat is usually made from a combination of different materials, which is then layered to make the composite thicker.
The chopped strand mat is the cheapest of the three types and is used in mold construction and projects that require a higher hull thickness. Often, the woven fabric is used between the two types of fibers to build up thickness. It can bond the layers together, thus reducing the overall cost.