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Thread: stitch and glue filler
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4th May 2012, 04:17 PM #1Intermediate Member
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stitch and glue filler
hi just started a stitch and glue design boat and want to know what is the best filler to use in the joints when mixed with epoxy ? where i get my epoxy supplies from they only sell wood flour ,talc , micro balloons , aerosil , milled fiber is any of them suitable ?
and if possible some where local im in lake macquarie nsw Australia
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4th May 2012, 06:31 PM #2Senior Member
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That range of fillers sounds like it should cover the full range of goops you will need to use. Go on the website of that particular manufacturer of epoxy and you should find all the info you need. If not try one of the others - Bote Cote, West System, System Three for starters
"World's oldest kid"
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4th May 2012, 06:49 PM #3Senior Member
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"World's oldest kid"
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4th May 2012, 07:51 PM #4
For general use filler, Micro balloons work well, I have not used Aero sil but I believe that it is an excellent filler,.
You will also need a Glue powder additive, as the other fillers are too soft for actually using as a glue filler, also most glue powders have another additive to prevent sag in (thrixotropic )
Talc is not a filler I would recommend as it is too hard.
My preferences are Micro-Balloons & Aero-Sil for fillers and a good glue powder as well.
Jeff
vk4Last edited by vk4; 4th May 2012 at 07:51 PM. Reason: resin type query
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4th May 2012, 07:52 PM #5
For general use filler, Micro balloons work well, I have not used Aero sil but I believe that it is an excellent filler,.
You will also need a Glue powder additive, as the other fillers are too soft for actually using as a glue filler, also most glue powders have another additive to prevent sag in (thrixotropic )
Talc is not a filler I would recommend as it is too hard.
My preferences are Micro-Balloons & Aero-Sil for fillers and a good glue powder as well.
Jeff
vk4
What type / brand Epoxy are you using???
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4th May 2012, 08:02 PM #6Intermediate Member
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4th May 2012, 08:06 PM #7Intermediate Member
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the plans say to use wood flour mixed with silica but don't no where to get silica from.
the boat is a tango skiff 13 footer from the us .
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5th May 2012, 05:49 AM #8
There are three basic filler mixtures; a structural filler mix, a light structural filler mix and a cosmetic mixture. With the exception of a cosmetic mix, micro balloons wouldn't be in the other mixes usually.
A structural mix would usually be a heavy fibrous filler, such as milled fibers and wood flour. These would be mixed with silica to control viscosity and covered with fabric.
A light structural mix would be more of the same, though could live without the fabric.
The cosmetic mixture will have a high concentration of round particulates, such as micro balloons or Q-cells, again mixed with amounts of silica, to control viscosity. Talc can also be used to make the mixture smooth and easy to fair. Often a light cloth is applied over these cosmetic mixes to improve abrasion resistance.
There is no one mixture that works for everything. The plans should give you an idea of what type of joint you are working with. For example; the chine seams will need a structural mix, while the inside of the cockpit seats, where they land on the sole, may just require a fairing cosmetic mix, to make cleaning easier.
The inside corners of a filleted joint are the most important, while the outside can often just live with a light filler and tape.
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