How many layers of fiberglass do you need for a boat hull? 1700 or 1708 would be much better and bulking between layers with chopped mat will help. At a minimum I would use two layers of 1700/1708 with one or two layers of mat somewhere in there and add an extra to the bottom surface wherever it may scrape bottom. Click to see full answer.
How many layers of fiberglass do I need for a boat?
I have the inner frame started. The number of layers required depends on whether or not the fiberglass is there to protect the wood, and be waterproof, or is part of the structural integrity of the boat. Another consideration is the quality of the roving.
How many layers of cloth do you put on a sailboat?
If the sole purpose of the glass is waterproofing then one layer of 300gm² (10oz) plain weave cloth is plenty. But on the hull go for 2 layers because of the size of the boat and the roller and skids impacting. How thick are fiberglass sailboat hulls?
How many layers of fiberglass do I need for roving?
The number of layers required depends on whether or not the fiberglass is there to protect the wood, and be waterproof, or is part of the structural integrity of the boat. Another consideration is the quality of the roving.
How many layers of Mat do I put on my Boat?
(i) cover the whole plug (your boat) with three layers of Mat. (One layer a day)...read the directions....done do to many layers at once ....too much heat. too much heat is bad...warp.....warp....warp
Why do you need 2 layers of cloth on a boat hull?
How much resin is needed to roll glass?
How to remove glossy finish from scotch brite?
Is fiberglass fatigued?
Does polyester resin harden in oxygen?
Is it easy to get a job on a boat?
Is it hard to watertight a sanding surface?
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How thick should a fiberglass boat hull be?
How many layers of fiberglass do I need for 1/4 thickness?
How many layers of fiberglass does it take to make a mold?
What type of fiberglass is used for boats?
Is fiberglass mat or cloth stronger?
How thick should fiberglass be?
How thick should a fiberglass mold be?
Begin by spraying 2 coats of Tooling Gelcoat (LBI 304) at least 15-20 mils thick.
How strong is a layer of fiberglass?
How thick should a mold be?
What are the three types of fiberglass cloth?
Which fiberglass cloth is strongest?
How do you install fiberglass on a boat?
MichaelG Junior Member
I'm building my first boat and need to know how many layers fiberglass cloth to use on the bottom. I'm using 6 oz. e-glass, 60" wide? The boat will be about 16' x 4' and plan on going up each side 6" with the fiberglass. I will be covering 1/4" Lauan. Can you use the slow hardners below 80 degrees to extend working time because of the length?
MichaelG Junior Member
The design will resemble a 16' Jon boat 4' wide 24" deep with a 2inch sub floor. I will use the boat on rivers and small lakes. I'm going to construct compartments for the oars, fishing poles, etc. I will build the boat so it can use up to a 15hp. motor. I have the inner frame started.
Moosemiester Junior Member
The number of layers required depends on whether or not the fiberglass is there to protect the wood, and be waterproof, or is part of the structural integrity of the boat.
MichaelG Junior Member
The cloth glass will do alittle of both, but more to protect the wood and waterproof.
MichaelG Junior Member
I had second thoughts about that 1/4" also. I believe my problem partly is I purchased a inexpensive Jon boat plan and I trying to make it better. I should just build on what I need for my uses. Your input I will use.
Moosemiester Junior Member
There's nothing wrong with the idea of using the old boat as a shell for new reinforcement. Three layers of 10oz cloth, using epoxy, properly applied, is amazingly strong.
PsiPhi Newbie
Hi, I've just started my first boat, a 12ft sailing dingy, and had my first enounter with epoxy.
Why do you need 2 layers of cloth on a boat hull?
But on the hull go for 2 layers because of the size of the boat and the roller and skids impacting. (personally i would use twill weave cloth but its harder to find and more expensive .but it sits flatter and conforms to tight internal 3 way curves better. But sitting flatter is all you'd gain on a hull.
How much resin is needed to roll glass?
For long areas you can’t tape on roll the glass onto a cardboard tube and roll it on . The resin amount required is idealy 0.8:1 with glass . So 800 grams of resin to 1 kg of glass . But thats probably not going to happen with one layer hand layed .
How to remove glossy finish from scotch brite?
Sand off any drips and sand the surface lightly to remove most of the glossy finish a scotch brite is enough . Just basically give it a scrub down with a green or red scotchbrite. Now its prepped annd ready for the glass. Do any reinforcing now and sand it smooth Before final overcoat that covers everything.
Is fiberglass fatigued?
Fibreglass is subject to fatigue in areas of repetitive or cyclic loading. High load concentration areas such as at bulkheads, transits, hull/deck joints and keel joints are particularly vulnerable. Salts suspended in seawater can move through some of the larger capillaries within the matrix.
Does polyester resin harden in oxygen?
A surprising truth is that polyester resin will NOT harden in the presence of oxygen. This is how unwaxed resin permits a chemical bond between the successive layers, and the wax in the final layer floats to the surface, excludes oxygen, and bingo! you have a fully cured application. 6/. Now sand the wax off.
Is it easy to get a job on a boat?
It is not easy to get a decent job, and much depends on the size of the boat. There will come a point where the cost of the resin and cloth stops it being worthwhile. Also, a boat of any size bigger than a dinghy will not take kindly to being turned upside down.
Is it hard to watertight a sanding surface?
Yes. It’s not even that hard to do well enough to be watertight. Doing it well is tougher. Making a repair above the waterline look good requires quite a bit of skill and effort as sanding a surface fair and matching a gelcoat colour are both difficult. These criteria are less relevant below the waterline.
