Remove all traces of the old plywood then sand and clean with 80-grit sandpaper. Materials: Use two overlapping layers of 1.5 oz fiberglass, cut into widths of about 36” for easy handling by a single person. When replacing plywood, what panel should be used? What weight fiberglass? You can even apply as many layers as you want at a time, as long as it's flat. This is what I did:-existing fiber-glass on transom-2 layers of mat 1½" oz.-1 24oz. Fiberglass has been chosen over KEVLAR® to keep costs low. What I did, was to layup a piece of 1.5 oz. Grind a 12:1 bevel on both side of the joint. Sticking them together is not going to give you much neither. the wood i used for the boat is 1/4 inch luan plywood. Decks made from wood will over time begin to warp and be discolored due to rain and sun exposure. Now im bored . Moreover, our panels are more mold and mildew resistant than plywood along with being resistant to insect infestations. You'll find many boats all over that used plywood as a form. And putting enough glass to make it strong enough. Would prefer to use only fiberglass. with this. Two layers of six ounce fiberglass, especially if both layers are saturated at once, isn't a lot heavier than a single layer and will still add a fair amount of abrasion resistance compared to painted plywood. Most building codes allow two layers of organic or fiberglass asphalt shingles on roofs with a 4/12 pitch or less, and three layers on steeper roofs. Often mechanical fasteners such as screws or through-bolts are used to secure the parts together, in addition to the use of a chemical bonding agent and sealant like methyl methacrylate or 3M 5200, which also makes the joint water-tight. Plan the cuts in each layer so the pieces are small enough to fit through the opening in the transom. On larger fiberglass molds, it may be more practical to add core materials to bring the mold up to the desired level of stiffness. Be sure and sand the edges where the inner layers of fiberglass attach to the hull, it will make bonding the new transom in place much easier. Preperation of the wood is the key factor to waterproofing really well. A few good answers here. fiberglass cloth for small homemade boat? A good way to waterproof and add a longer life to a wood deck is by covering it with fiberglass. Among them, the best is using a wooden sealant. 2015 - correct, apply one layer of fiberglass (overlapping edges a few inches), then go back and apply a second layer centered on the seams of the first layer. all fiberglass cloth will turn clear when it is fully saturated so if you see white spots those are dry spots and you need to work more resin into those areas. Vacuum up the dust and wipe down the fiberglass with acetone. Since then I have put dozens of 5200 bottoms on boats but my last restoration was a 1956 Capri and I decided to do another 2-layer plywood bottom covered with glass. Coosa's panels are made of high-density foam and fiberglass and will not rot. If it's on a wall you may have a problem with the glass sliding down if you apply to many layers at once. The common domestic North American type of marine-grade plywood used as a ‘go-to’ for many shipbuilders is Douglas-Fir Marine Plywood 5. To work with fiberglass, purchase a fiberglass kit containing poly resin, hardener, and cloth from a home store. These three things combined are poor mans fiberglass. I'd use two layers of 1/2" Oak Plywood glued and bolted together then fiberglassed. Then I epoxied one piece of plywood to the inner liner. It is not a problem to make a very thick transom by using epoxy to laminate many layers together, in fact it is quite the opposite. I have been using fiberglass making tubs and showers for 18 years. Solid hulls were the rule in the early days of fiberglass boatbuilding and many are still found in both older boats and new boats. Using a piece of plywood and some of the scrap trimmed fiberglass, mix a small batch of epoxy and do a wet out. Also, you need to overlap with the surrounding existent fiber-glass. Mix the resin and hardener according to manufacturer recommendations. Etc. If you plan to drag the boat a lot on beaches, the Xynole would be one of the best choices. You don't have to sand if you apply the second coat while its tacky. Post details on the forum and we can help with this. In this article (and Video) I'm going to show you step by step how to remove your old rotten transom and replace it with a new one. Ordinary plywood usually has 3 to 5 layers, while marine plywood has ten layers or more. I will be making it from a fiberglass mold that I will have to construct. matt to both sides of both pieces of plywood. They have been in business for over 50 years. It also depends on exactly what type of fiberglass you’re talking about, as well as the weight (thickness) of each layer. Three-quarter-inch plywood supports the loads, but fiberglass needs to seal and protect both the inside and the outside of the boat. Most powerboat transoms are made by laminating multiple layers of 1/2" or 3/4" plywood. How to Apply Fiberglass to Wood Turn the heat in your shop up until the room reaches about 90 degrees, and allow it to maintain that temperature for 20 minutes before beginning the fiberglass procedure. Build a mold out of wood, cardboard, or foam, then lay the cloth over your form, allowing for plenty of overlap where it joins at corners or sharp curves. I will be covering 1/4" Lauan. Usually the stringers will be in box form (a rectangular profile) because that was the simplest construction method. Apply layers of fiberglass tape into the dished out cavity, widest layers … See how long it takes for the epoxy to "kick off" (begin to gel), how long it takes for it to get cured enough to do a fill coat, and generally learn how to measure, mix, and handle it. Gripper; Sheets; Paint For the fiberglass to properly bond, the deck must be constructed out of 5/8- to 3/4-inch thick T/G plywood. Epoxy or Polyester resin? Combined they make up what you need to know. will one layer of fiberglass with resin and hardener be strong enough for a small speed boat? Fiberglass is lightweight, corrosion resistant, economical, easily processed, has good mechanical properties, and has over 50 years of history. I am building a box to act as a fish tank. Making Poor Mans Fiberglass. The new fiberglass will then attach to the old and provide a surface area which offers even support. e-glass, 60" wide? I'm using 6 oz. Most powerboat transoms are made by laminating multiple layers of 1/2" or 3/4" plywood. I replaced the bottom of my 1930 Chris-Craft Model 100 “Moxie” over 25 years ago with two layers of plywood covered with fiberglass cloth and have never had a problem. Actually the job was pretty easy, untill you get to the finishing part. 38″ (which on a small mold is perfectly acceptable). The more layers plywood has, the stronger it will be. buying boat supplies for it but i need to know if i should have two layers over it. You have to add layers of mat and or woven roving in between the plywood. However, there are several ways of waterproofing plywood for a boat. There’s no set number. woven roving-2 layers of mat 1½" oz.-plywood You can choose any suitable sealant. How many layers of 6oz. Only difference, my transom was flat, so I used two pieces of 3/4" plywood to make 1 1/2". when working with epoxy you need to apply the first layer of cloth ,and all other layers of cloth, and insure there are no dry spots. Applying fiberglass cloth or tape to surfaces provides reinforcement and abrasion resistance, or, in the case of Douglas Fir plywood, prevents grain checking. Similarly, it is asked, how many layers of fiberglass do I need for my boat? The forms were made out of whatever was handy. Plywood Company has been FSC certified since the year 2008. The floor isn't just fiberglass, even though fiberglass is strong it would have to be about 4" thick for a 4' wide deck not to flex. When there is existing fiberglass, grind a 12-to1 bevel on the stringer. I'm building my first boat and need to know how many layers fiberglass cloth to use on the bottom. Plywood Company. Many boats are designed with a “shoe-box” joint where the hull and deck have mating flanges, or overlap one another. Fiberglass is actually short for “fiber reinforced plastic,” referring to the various weaves of glass fiber cloth that are laid down in alternating layers with any number of resins such as polyester, vinylester, or epoxy. The time to apply fiberglass cloth is usually after you’ve completed fairing and shaping, and before the final coating operation. The most common types of ply available are 3 ply, 5 ply, and 7 ply, though you can also find plywood with as many as 13 layers of veneer. Re: Fiberglassing over marine grade plywood help That wont solve your original problem of the sogy floor. It is not a problem to make a very thick transom by using epoxy to laminate many layers together, in fact it is quite the opposite. Bluewater 26 is the strongest and stiffest panel we make and most like plywood. It is excellent marine plywood for use when the plywood has a coating of fiberglass instead of varnish. For example, 9-10 layers of 1.5oz fiberglass mat will give you a mold thickness of around . The boat is 12 feet long, 4 feet wide at the bottom, each side is 2.5 feet tall, and the transom is 2 feet by 5 feet. Replace the fiberglass skin and install new plywood core. It depends on the loading, the framework, the weight of the boat, and many other factors as well. If the structure can support the added weight, a typical 20-square (2,000-square-foot) reroof will cost at least $1,000 less than a tear-off job. Rebuilding the transom on your fiberglass boat is no easy task but unfortunately it must be done on many older boats, usually due to rot in the plywood core. The dimensions are 58" long x 40" wide x 36" tall. 2. Poor Mans Fiberglass is a process of combining an adhesive like Titebond 2 (sometimes diluted with water) or “gripper” primer that is made to help paint adhere to surfaces, Material like canvas or bed sheets, and outdoor paint. When using a fiberglass skin, it is difficult to fold it over, especially at a 90-degree angle. Buy the small 2'x2' pieces and it'll cost about $18, Cut the perimeter after gluing together so you have no overhangs between the pieces and the fiberglass will uniformly adhere to the edges. waterproofing sealant=> Check on Amazon=> First, sand the plywood surface with 80 grit sandpaper. Glue the layers in place. Roll the resin-soaked roller directly onto the wood surface to seal it. To understand fiberglass lamination, it is best to focus first on simple solid laminates in which multiple layers of fiberglass fabric are built up to the thickness necessary to make a part strong enough to do its job. It will hold close to 300 gallons. Poor Mans Fiberglass, Permanent Exterior Paint, Never Paint Again (almost), Waterproofing With Out Epoxy, Fiberglass Epoxy Allergy Relief: Back in 2011 I built a teardrop camper, at the time I needed a place to sleep a few nights a week as the long drive home was causing me to fall asleep behind the wheel way to often. The new core can be either made in one piece, then bonded into the hull, or … Located in the Dallas-Fortworth area, Plywood company is another leading distributor of Marine grade plywood, among many other products. I got the plans for the teardrop free from the best teardrop traile… How many layers of fiberglass will I need? Plywood will always have an odd number of layers, and this is to help balance the board and reduce the chance of warping. In the Northwest, you'll find many forms made out of Spruce or Fir, In the Northeast, you'll find many made out of Pine. The boat will be about 16' x 4' and plan on going up each side 6" with the fiberglass. However, if treated like fir marine plywood, exterior plywood can be acceptable. then there is a lot of grinding involved. the floor/deck on your boat is most likely a wood floor that has been fiberglassed over. Sticking them together is not going to give you a mold thickness of around from. Of how many layers of fiberglass over plywood grade plywood help that wont solve your original problem of the old and provide a surface area offers... Then sand and clean with 80-grit sandpaper i did: -existing fiber-glass on transom-2 layers of 1/2 '' 3/4...: use two overlapping layers of 1/2 '' Oak plywood glued and bolted together then fiberglassed surrounding... 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