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Had a surveyer look at my boat this morning, and he told me he does not like the idea of simply using 10 oz cloth for bulkheads. He says it will not adhere to the hull and that I should have using roving or mat for my first layer. Hmm, I have read a lot on Sailnet about bulkhead replacement and I do not ever remember seeing anything on using something other than what I used for the bulkheads. Hmm, now I am concerned......
 

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If you are referring to tabbing in, the use of 10 oz cloth with epoxy is what I would do. A couple of layers would be very strong. I have never seen mat used. Also if you're using mat with epoxy you should use great care, as it may delaminate.
 

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Tundra Down
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The surveyor is just stating best practice. If you are adhering fg cloth to anything a layer of mat gives the layer of 10 oz. cloth more "surface contact" because it fills what would be voids between the threads of cloth with more resin. it doesn't contribute much to the structural strength but it would improve adhesion. I don't think it is necessary but you might buy some biaxial cloth that has a mat layer attached and use that. It will be strong and secure. With the mat already attached and using an air roller to spread your resin (epoxy) You should get a professional job. Wet the surfaces you are going to attach the biax to with resin, lay out the piece of biax onto the wetted surface, apply some more resin on the fabric side and spread it throughly using an air roller to force the resin into the cloth and any air out. It won't hurt to have a pint of MEK (not MEK peroxide) for cleaning up the epoxy resin especially from the air roller so it will live to roll another day. (you pre fit it and pre cut the biax and prepared the surfaces well, correct?) I am understanding that you are fastening bulkheads with the fg not building them out of fg, right? Be safe and wear some nitril gloves and protect your eyes. Epoxy resin is the best solution but it is a skin irritant and there are people with acute allergies to it that can produce serious reactions.
 

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Telstar 28
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If you're doing a structural repair or reinforcment, don't use Polyester or Vinylester resin, as epoxy resin will give you a much better repair.
 

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Woven rovings and mats will add thickness (and weight) but not as much strength. Using biaxial fabrics you can add much more strength without the added thickenss and weight of conventional fabrics. The softer and fuzzier the mat, the less binder it has, which means it should work better with epoxy. Assuming you can even find "fluffy" mat with less binder made for polyester don't use it. It gives a dry, weak layup.
 
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