Wooden Boat People
By McKenzieDriftBoat.com
Fiber Glass
Hi, I'm looking for information on the weight of the fiberglassrecommended for the bottom of a 16 'Mc Kenzie. I have understood that the best option is 20 oz. If it is correct, need to know the conversion to grs/m2.
For the bottom I'll use 1/2 inch plywood.
Once again I apologize for my English.
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Replies to This Discussion
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Permalink Reply by Rick Newman on
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Andres, your English is much better than my Espanol. I understand all your comments. There are 28 grams in an ounce so I would multiply 28 x 20 = 560 grs for the weight in grams for 1 yard2 of fabric.
1 yard2 = .9144 m2. So 1 m2 weighs 560 x .9144 = 512 grs
I hope that this helps.
Rick Newman
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Permalink Reply by Phillip Westendorf on
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Rick/Andres,
Not trying to be dis-respectful but the correct answer is 678.1149 Grams per square meter. If you write out the problem (in text) in "Google" it will give you several places to get the answer.
Enter this in Google; "Convert ounces per (square yard) to grams per (square meter)" then choose the first choice.
I just entered 20 in the Square Yards box and hit convert and .... well you know what happens. Cool thing about Google is you can enter a numerical equation and it will give you the correct (assumption on my part) answer.
phil w.
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Phil, Thanks for the correction. I too went to Google but asked the wrong question. I apparently went from square yards to square meters. Obviously a meter is 39.3" which is larger than 36". I should have caught the fact that my multiplier was less than one (.9144) rather than greater than one (1.19599)!
Goog catch,
Rick Newman
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Permalink Reply by Andrés Ramos on
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Thks
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Andres,
If your going to Fiberglass the 1/2" (12mm) Plywood bottom I'd recommend using two layers of 10 Oz cloth. If you lay down the first one and cover it adequately with 3-4 coats of Epoxy you can go back a few days later and add the second one. You just need to sand the first after it is cured (hard) so the second application of epoxy will bond (mechanically).
If the application of Epoxy is new to you and your not confident in doing it, just spend some time and study the process. West System has a Website, http://www.epoxyworks.com/ there is a very good article in the most recent issue by Ted Moores, and he’s a terrific guy and knows wood boats, canoes and glassing. They have very good instructions for the Dry and Wet methods of applying epoxy to glass on wood in their User manual, http://www.westsystem.com/ss/how-to-publications-2/. There are lots of other web sites with similar information on this subject. I did the research this way and by the time I glassed my Stripper Canoe (my first) with two layers of glass I had no problems.
I would recommend you have a helper when you do it the first time. My son mixed the epoxy in small batches for me so I didn't have to stop to do that. I was able to apply it continuously with out stopping.
G'Luck,
phil w.
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Phil/Rick, thanks for the tips.
Now i need to know how much epoxi will i need to glass 1 yard2 (or 1 m2).
Thks
Andres
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Andres,
If you go to the West System Web Site there is a place ( I just saw it tonight on their web site) where they have a method to calculate the amount you typically need. I'd guess two gallons is about close.
phil w.
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Phil, thanks on the info. I understand that you mean about two galons for the entire boat. ¿That´s correct?
i think i will glass the exterior of the side panels with 1 layer of 10 oz glass, the interior with 1 of 6 oz, and the bottom with 2 layers of 10 oz. ¿What do you think about it?
Thanks,
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Andres,
Your plan sounds good. When you epoxy the exterior surfaces you'll want to completely bury the cloth so it results in a smooth surface. It will take three-four coats of epoxy per layer of cloth. If you follow West's method (rolling the third and fourth coats) of application you should be OK.
When you do the inside surfaces you will not need to "bury" the cloth. Just two coats of epoxy for this condition. By not adding the third and fourth coats of epoxy the weave of the cloth will be exposed and make the bottom less slippery (when wet) and save on epoxy. This may or may not be something you want to do if there are floor boards on top side of the framing. The weave of the cloth will hold dirt and other stuff and require more and frequent cleaning. This is a common thing to do in canoes.
If you are using the same epoxy to the joining of the framing, seating, and other finishing of the boat two gallons might not be enough. Depending on the availability and cost of shipping you might want to purchase more initially. Then you will have some left-over epoxy for other projects. I seem to use it for a lot of things just because I have it handy.
Hope this helps,
phil w.
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Thank you Phil!
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