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Fiberglass Mat, also known as Chopped Strand Mat or CSM for short, is a non-woven material typically used for laminate build-up and repair work. It consists of glass fibers laid randomly across each other and held together by a styrene binder.
Polyester is the preferred resin for wetting out this form of glass fiber material as it readily dissolves the styrene bonding agent.
Offered in various weights per square foot. The lightest version, veil mat, is used commonly as a finishing layer to mask any print-thru in a laminate schedule. This particular veil mat uses longer, thinner fibers than heavier mat weights also offered here. Think angel hair pasta to spaghetti fibers. Coarser, heavier mat is commonly used for bulk, random axis strength buildup and is also an excellent initial layer when bonding repair work.
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Is this CMS mat OK to be used with Total Boat 5:1 epoxy resin ? I are replacing engine mount stringers and I was going to also use this CMS and then use a 1708 fiberglass cloth and / or triaxial fiberglass cloth over wood ? Hopefully epoxy resin will work as a wet lay up on all of these cloths?
CSM is not as easy to use with epoxy resins as it is with styrene thinned resins such as polyester or vinyl ester. Fiberglass cloth is generally the product to be used with epoxy resins. CSM still can be used with epoxy but it does not wet out nearly as well, and more laborious to saturate properly.
JD Tech Associate
Will epoxy work with chopped glass mat ok?
Chopped strand glass mat is really designed for use with a styrene thinned product such as polyester resin or vinyl ester because the styrene breaks down the binder that attaches the strands, and allowing it to wet out very easily. Epoxy will saturate the mat to a degree, but it is laborious to work it in. There are usually cloth materials with a light and fine weave that allow you do do similar things.
JD Tech Associate
what type of material and how much i need to fiberglass a 18 .ft wood Boat . in and out
I'd recommend 6 oz woven cloth, it will lay down better. It comes in 38 and 50" widths.
JD Tech Team
I have a 20ft sea ox center console boat, im replacing the floor from front to back, along with new stringers, could you tell me how much and what thickness mat I should use and approximately how much resin and hardner?
I'd recommend 1708 biaxial cloth which is a total of 25oz / sq yd and would take a 3 to 1 ratio of resin to cloth.
JD Tech Team
I just want to put a layer of FG between my new plywood floor and the carpet on a 6' x 12' boat deck. How wide are the rolls and how many layers should I use?
6 oz cloth comes in 38" or 50" wide. A couple layers depending on how strong you need it to be. 10 oz cloth only comes in 38" width.
hey there I'm looking to extend my jeep fiberglass body n would like some ideas of what i should be using instead of just guess?? i have to extend it about 26" i'm going to cut it all most in half n rebuild the middle n that is were i need help??? any pointers would be a great help thanks.
Only to find out what type of fiberglass the body is made out of?
how much strength will 2ounce per sq foot matting add to my transom?
The question is to hard to answer. What is wrong with the transom? What is the stiffener for the fiberglass? I would ask the manufacturers of the products you are usingfor technical data for their products both for mat and resins.
2oz cloth is better used as a finishing layer. For strength 18oz or heavier is best.
Can you tell me approximately how much epoxy resin I need to lay 3 square yards of 2 ounce CSM?
it will roughly take about one quart per yard on a flat surface. laminating resin is better than a all purpose resin (it has less wax and saturates better). a gallon container should do the trick and is cheaper than three quarts, and should be plenty for later use. i hope this works good luck
I am sorry ed never mind my entry i just reread your question and realized you said epoxy. polyester resin will not stick to epoxy.
Couldn't see where to enter question. How thick is 1.5 oz fiberglass mat in inch, cm, micron, etc.?
i have rebuilt 4 boats .that ads up to around 30 gallons of west systems epoxy.a good layup 1.5 =1/6". +/-
About one or two millimeters. There is a slight variation throughout due to the matte. It is also lays down thinner once resin is applied and rolled through the material.
I am replacing the floor in my boat 20' center console, Floor is out and wood is cut and ready to go back in..I plan to screw it down w/ stainless screws and adhesive1. What adhesive do you recommend?2. What type of fiberglass mat do you recommend..Cloth or Chopped Strand ?Thanks George
George, I found that when working with fiberglass resin, the resin itself is a wonderful adhesive for wood, especially if you have a thin later of mat resin-ed between two pieces of wood. I personally did not use any screws, whatsoever, to secure wood to fiberglass. The only place I would recommend using screws of any kind is on wood to wood applications. When I was redoing the fiberglass bottom (hull) of my boat, I alternated between chopped mat and woven. Woven is much stronger than mat, so I think that is necessary for stability/strength purposes. The mat helps to fill in the spaces between each layer of woven and helps to keep the overall area flatter. Basically, I kept this thought in mind throughout my project - Woven for strength, mat for fill. When I was finished repairing the fiberglass hull and I had my plywood ready to go down, I used construction adhesive (liquid nails or PL400) for the places the plywood would meet the wood foundation pieces below it and also where the plywood met the hull. On my boat, plywood meets the hull only at the outer edges of the boat. My boat has something akin to a 'shelf' around the edges that I tapered the joists into. So, the plywood floor sat on both the joists and this shelf seamlessly. If you want to screw the floor to it's wood foundation (the joists) below, I suppose you could. I think it's overkill. The floor will be sandwiched as it is and construction adhesive bonds like you wouldn't believe. So, again, avoid screwing (or nailing) into fiberglass if you can. Construction adhesive has plenty enough bond...that floor won't move! Use woven fiberglass for strength and mat for fill. If you need to build up an area and one layer of glass won't do it, alternate woven and mat, woven and mat, until you realize your desired thickness. You will want to end this layering with mat being on the top. It will be more flat and easier to sand flat. Best of luck
Well George I can't answer this question without knowing a couple of things ,like is this a deck that is being tabed into the hull or does it need to be removed later,how thick is your plywood? If this is a permenant deck I wood use epoxy to glue and screw it then I would probably use a layer of mat ,a layer of roven and then another layer of mat and overlap the last layer up the sides of the hull 3 or 4 inches.Then you can gell coat or paint it. I use 1.5 oz. mat on my finish layer and 3/4 oz on my first layer and a heavy roven in the middle. hope this helps.
George,I used the Chopped strand mat to redo the transom on my boat and it worked out great.
I would use 5200,On the fiberglass i would use 1.5 oz mat with
Pretty straight forward material
This is my first time doing any type of fiberglass work on my boat. The CSM fibers end up coagulating together and make a mess. This might be a norm with fiberglass work but that's the only annoyance I found with it.
Great for fast build up
I use fiberglass mat as a middle layer between woven layers to add bulk
It's too thin. I think toilet paper is thicker.
Great product & great service from JM
I use the CSM to make a composite cover for a boat that I fabricated
Had no idea i was getting such a large piece!
I had no idea how big the piece is, A great deal for the price as it will never go bad.
It did exactly what i needed
I needed a lite weight glass to wrap around 3/4'' plywood the had a 1/4'' radius on both sides. It conformed with no lifting on the small radius.
Kent Island, md
Works for me
I used this product to build up the space left after I removed the rotten wood in the repair of my trawler's door. I found this messy and difficult to work with mostly because I really don't know what I'm doing. The good news is in the end it does the job.
very good purchase
Really like your company and plan to do business again on a regular basis
Scott City Kansas
Good delicate material
I actually bought this to use in a situation it was not created for I assume. I have used Nu Wall fiberglass to repair cracked plaster walls, it works very well using it and their other products. This fiberglass mat is much lighter and delicate, so I thought it would be useful on smaller cracks. It worked, I used a glue and then plastered over it successfully to hide the crack. I am sure it would work great as a fiber/epoxy build up for curves etc.
I requested the 1708 be rolled rather than folded. Received the product on a nice sturdy cardboard tube. The CSM I also ordered did not, which made it much more difficult to unroll and cut.