Re: Fiberglass mat vs cloth
Mat=CSM, aka Chopped Strand Mat, comes in various weights
Cloth= a woven type of mat that is stitched together to form a cloth-like fabric, comes in many weights and configurations
All are used in the construction, repair and restoration of boats.
Depending on the the final strength and cosmetic results you are trying to achieve, either or both or a combination of the various types can be used...
Some are used mainly for strength, some for cosmetic finishing, some for building thickness, some even do it all in one 'cloth'
I generally use 1.5 ounce CSM as a base layer to which I then apply successive, alternating layers of 1708 biaxial cloth and CSM to reach my desired thickness...If I am going to be finishing the surface off with gelcoat or paint, I will usually make a thickened resin as a filler to smooth the surface...
Some may use a "veiling" material, which is layered over to create a finished surface, either for a final application of gelcoat or paint...
If I am not concerned with having a smooth finished surface, say under the decking or in the bilge area, I may paint over the textured finish with any of the following; gelcoat, paint, bilgecote, etc...just to add an additional layer of sealant to the surface...
Here is a good resource relating to fiberglass...
http://forums.iboats.com/boat-resto...ake-fiberglass-information-thread-286013.html