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Ortho-polyester resins are the weakest and most brittle of all resins used in boatbuilding. They Fiberglass Boat Construction Methods Level are also the most vulnerable to chemical attack and are the least water resistant. This Fiberglass Boat Construction Methods Level Fiberglass Boat Construction Methods Level last feature is particularly important, as the more easily water can pass through a resin into a laminate, the more likely it is the laminate will develop osmotic blisters over time.
Iso-polyester resins are slightly less brittle and are considerably more chemical and water resistant. They are also, of course, more expensive. Builders therefore commonly use iso-polyesters in the gelcoat and external layers of a laminate and cheaper ortho-polyesters in the internal layers. Iso-polyester resins are just strong enough to support most sophisticated glass fabrics, though they are probably not quite strong enough Fiberglass Boat Construction Methods Level Fiberglass Boat Construction Methods Level to be used effectively with exotic fabrics.
Vinylester resins are the next step up in Fiberglass Boat Construction Methods Level quality and cost. They are similar to polyester resins and utilize the same catalysts, but are markedly stronger. For example, a good iso-polyester resin may elongate by as much as 2. A Level Fiberglass Construction Boat Methods vinylester resin, by comparison, can elongate up to 5 percent of its length before fracturing Fiberglass Boat Construction Methods Level Fiberglass Boat Construction Methods Level and has a tensile strength of about 11, pounds per square inch.
This makes vinylester the resin of choice when laminating with more sophisticated fabrics. Vinylester is also much more water Fiberglass Boat Construction Methods Level resistant than both ortho- and iso-polyester resins, thus is less prone to blistering. Because they are chemically similar and bond to each other well in both a cured and uncured state, Fiberglass Boat Construction Methods Level vinylester and polyester can be used interchangeably in a laminate.
This gives builders great flexibility. As boat buyers have become ever more wary of blisters, even mass-production builders now increasingly use Fiberglass Boat Construction Methods Level vinylester resin in the exterior layers of a laminate to reduce water permeability. They then Methods Boat Level Construction Fiberglass switch to polyester to finish the bulk of the laminate and so keep costs under control. Vinylester Fiberglass Boat Construction Methods LeveFiberglass Boat Construction Methods Level l is now also commonly used throughout laminates in racing and high-quality cruising boats.
The best, most expensive boatbuilding resin is epoxy , which is stronger than both polyester and vinylester. Its elongation before failure is usually more than 5 percent, and its tensile strength is about 12, pounds per square inch. Epoxy is also more adhesive, forms better bonds particularly post-cure bonds , and is even more water resistant and thus more blister resistant than vinylester resin.
Epoxy Fiberglass Boat Construction Methods Level resin, however, is fundamentally different from polyester and vinylester resins. Its secondary component is not a catalyst that enables a chemical reaction, but a hardener that is integral to the reaction that causes epoxy to set and solidify. To achieve full structural strength, it is best to Fiberglass Boat Construction Methods Level post-cure epoxy at elevated temperatures. It is incompatible with most chopped-strand mat, as it does Fiberglass Boat Construction Methods Level not properly dissolve the binder in the fabric.
Plus, it is only semi-compatible with vinylester and polyester; it may be laid down on top of cured polyester and vinylester, but they may not be laid down on it, whether it has cured or not.
Epoxy is often Fiberglass Boat Construction Methods Level Boat Construction Level Fiberglass Methods Construction Methods Level Boat Fiberglass used when making repairs to fiberglass boats and may be used in the secondary phase Fiberglass Boat Construction Methods Level Level Boat Construction Fiberglass Methods of construction when structural parts are being attached to an already cured hull. Epoxy is also Fiberglass Boat Construction Methods Level Fiberglass Boat Construction Methods Level often applied below the waterline as a barrier coat to prevent blistering. But because it is so very expensive, it is rarely used as the primary resin in a laminate, except in the most cutting-edge boats. The easiest way to lay up a fiberglass hull is by hand in an open mold. The resin itself can be applied in different ways.
The crudest method is to simply slap it on with brushes from buckets of catalyzed resin. Now, Fiberglass Boat Construction Methods LFiberglass Boat Construction Methods Level evel however, it is more common to see workers wetting out fabric with airless spray guns Fiberglass Boat Construction Methods Level Fiberglass Boat Construction Methods Level or special resin-fed rollers.
With spray guns the resin and catalyst are mixed as they Fiberglass Boat Construction Methods Level are sprayed onto the fabric. With rollers the resin is catalyzed just before being pumped to the roller head. Spray guns and rollers obviate the need to constantly mix small batches of resin, which remains perfectly fluid for only a few minutes after it is catalyzed. Each step in creating an open-mold laminate is therefore a race to get the next layer of fabric laid down and wet out before the previous one sets up too hard.
One advantage of using polyester and vinylester resins is that the time it takes for the resin to kick can be controlled by using varying amounts of catalyst. But this only buys so much time.
The maximum recommended time between the application of layers is normally about 16 hours, but the shorter the interval the better. This is less daunting when working on a small hull, but if the hull is large it can be problematic. In many cases, ideal chemical bonds are not always achieved and some areas of an open-mold laminate end Construction Boat Fiberglass Methods Level up inherently Boat Construction Methods Youtube weaker than others. Voids are another problem. These are small pockets of air Fiberglass Boat Construction Methods Level that get trapped in a laminate as it is laid up.
The simplest way to drive air out of a laminate so it sets up solid is to compress the layers Methods Level Boat Construction Fiberglass of wet-out fabric together with handheld rollers. These rollers have ribs that help crush air bubbles Fiberglass Boat Construction Methods Level Construction Fiberglass Level Methods Boat and spread resin more evenly through the fabric. Using rollers, however, is labor intensive, and Methods Construction Fiberglass Boat Boat Hull Construction Methods 10 Level the extra time spent squishing down each layer of wet fabric only decreases the chances of Fiberglass Boat Construction Methods Level a chemical bond being formed with the next layer.
There is a more sophisticated technique for pressing air out of a laminate, called vacuum bagging, that has been around since the Fiberglass Boat Construction Methods Level earliest days of fiberglass boat building. Here a plastic skin is taped over a layer of laminate after it is laid down and wet out, then air is pumped out from beneath the plastic.
Once the epoxy has cured, fiberglass can be added and the shape is faired and sanded. The hull is then flipped and much of the jig removed and Fiberglass Boat Construction Methods Level discarded so fiberglass or structural reinforcements can be fitted to the hull interior, and interior Fiberglass Boat Construction Methods Level construction can begin. The deck and cabin are built in much the same way. Fiberglass boat construction became popular in the s and today is perhaps the most common way production Fiberglass Boat Construction Methods Level boats are built. Upsides to this method include relatively low maintenance, high strength, ease of repair, and generally low cost when compared to other boatbuilding materials.
Primary downsides are osmotic blistering in some hulls and sometimes heavy weight unless used with composite materials. Most fiberglass boats are built from a female mold that accepts multiple layers of fiberglass cloth or matt and Construction Methods Boat Level Fiberglass resin that eventually cure together to form a hull shape.
First, the mold is cleaned and prepped with a mold release wax that allows what will become the fiberglass hull to Fiberglass Boat Construction Methods Level be pulled from the mold without sticking. Next, a thick layer of high-quality resin called gelcoat is sprayed into the mold. This is the tough, glossy, exterior finish that protects the Fiberglass Boat Construction Methods Level fiberglass from ultraviolet rays, salty spray, fish guts, beer, and abrasion.
Sometimes, though, core materials such Fiberglass Boat Construction Methods Level Fiberglass Boat Construction Methods Level as balsa, marine plywood, or foam are used to increase strength without adding extra layers Fiberglass Boat Construction Methods Level of relatively heavy fiberglass. Some boats use composites in throughout in both the hull and deck. Even with solid fiberglass hulls, stringers and bulkheads are used to provide a strengthening gird that keeps the fiberglass laminate from flexing too much. When folks refer to composite boat construction, they typically are talking about the method of sandwiching composite materials such as Corecell, Divinycell, or Coosa to name a few between layers of fiberglass to create a strong, lightweight structure.Fiberglass Boat Construction Methods Level
Pros for this type of construction are its immense strength but lightweight qualities, which mean Fiberglass Boat Construction Methods Level Fiberglass Boat Construction Methods Level a boat that typically weighs 20, pounds can be constructed to weigh 12, pounds.
The drawback is the cost of the composite materials from which this type of boat is built, Hand Laid Fiberglass Boat Construction Number Fiberglass Boat Construction Methods Level which can be quite high. A completely composite hull and deck are generally built much like Fiberglass Boat Construction Methods Level Fiberglass Boat Construction Methods Level a cold-molded boat see above , but instead of wood veneers being attached to the jig Fiberglass Boat Construction Methods Level to form the shape, sheets, panels, and strips of composite foam are used and glued together.
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