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Old 04-25-2013, 11:12 PM   #1
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west systems fillers

Has anyone used alternate fileers (sawdust etc) to effectively thicken the epoxy as opposed to west systems 405 filler
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Old 04-26-2013, 12:13 AM   #2
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I've built several small boats in the last few years and often used sawdust to make cosmetic filler to hide my many mistakes. It worked fine. I made the saw dust by clamping my belt sander in a vice and holding a scrap of the wood I was trying to match against the belt. What is your application?
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Old 04-26-2013, 06:10 AM   #3
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Sawdust is perfectly acceptable as a filler. Wood flour is just a finer version of sawdust and sold as filler.
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Old 04-26-2013, 06:34 AM   #4
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DO not use sawdust if filling underwater blisters!
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Old 04-26-2013, 10:45 AM   #5
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I keep several jars of sawdust from various species for color match touch up, both with epoxy and Titebond III. They work great. Have also used corn starch in a pinch (when the First Mate wasn't looking !
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Old 04-26-2013, 02:37 PM   #6
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lots of options see
Cheap Marine Epoxy Fillers,Thickeners, balloons, graphite powder, teflon (tm)
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Old 04-26-2013, 03:17 PM   #7
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I've also used sawdust for wood repairs on the interior (fixing some water damaged teak ply). For everything else, I usually buy the commercial stuffn (mostly fumed silica). Most of the fillers can be bought for less than West prices.
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Old 04-26-2013, 03:21 PM   #8
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Regardless of what filler powder you mix with West epoxy, the cured result will be as hard as diamonds. Try to do the majority of your shaping while the stuff is still a paste.
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Old 04-26-2013, 06:08 PM   #9
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As Mike said above, hard will be. There's no way water will disturb the wood powder inside of the fillings if it is pre-mixed before application.
Yet, if you still want to go alternative, try industrial talc powder.

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Old 04-26-2013, 10:17 PM   #10
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Tangler,

I have used sawdust many times as well. The dust from 100 grit paper on an edger (floor sanding machine) is as fine as flour. I keep oak and pine on hand in a plastic coffee can with a snap on lid.

Mayby a local floor sander would save some for you. We produce a lot of it over a year!

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Old 04-28-2013, 01:16 PM   #11
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when adding thickeners to epoxies keep in mind that some brands of epoxies are way more brittle than others. Those with very very brittle epoxies are the least likely to mention brittleness issues. Bittle epoxy is not good in dealing with impact issues.

of course when using epoxy with fiberglass cloth, all the issues and properties change.
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Old 04-29-2013, 10:32 PM   #12
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thanks guys. guess I will save some bucks and use sawdust. The damage is between the deck and ceiling of the upper deck - the corners and right accross the stern. all repairable and it will be better than new.The flying bridge brow board and the teak deck had been leaking for years. Had to remove the old teak deck also but will salvage some of that to repair the main cabin floor next year. will do a new fiberglass deck upstairs after repairs are done.
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Old 04-30-2013, 06:28 AM   #13
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"The damage is between the deck and ceiling of the upper deck"

That is the probably the overhead.

Ceiling is what covers the hull inside
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Old 04-30-2013, 10:04 AM   #14
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