Which Epoxy?

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graham

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Excuse my ignorance but what is "wood flour" ?I have been thinking of building a small daysailer using ply/epoxy. I have very little experience with epoxy so am at the picking other peoples brains stage.
 

dur

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[ QUOTE ]
what is "wood flour"

[/ QUOTE ]

Its the dust that you get from sanding wood as opposed to sawdust which you get from eg. sawing wood. Much finer in other words. Sort of like flour!

If you have a power sander with a dust bag, you will find plenty.
 

Lakesailor

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If you can make your own from the wood you are using it makes a good colour match for the construction. Otherwise it's cheap enough to buy from a good epoxy supplier.
 

graham

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Thanks for that. Can you use it to thicken epoxy for filleting the joins at the chines and other corners or is it neccesary to use something hi tech for structural joints?
 

Lakesailor

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Technically I don't know, but the guys at Fyne Boats mix silica and woodflour together for fillets because the silica on it's own slumps (as has been said already) but the wood flour binds the resin.
I used just wood flour for the fillets on my floats for my project trimaran, but used silica and wood flour together when re-making and repairing the frame joints on the Heron dinghy.

There isn't much stress in the floats. It's best to paint the pure resin mix lightly on the wood where the fillets are going to get good penetration, then mix up the fillers in the rest of the resin and apply as fillets on the wet resin you've just put on the wood.
You need a slow-curing hardener so that you've got a good 20-30 minutes working time.
 

graham

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Thanks for the advice. I had thought of building an Optimist first but have been told the wooden ones dont win races so may build a small tender or something first rather than make expensive mistakes on something larger.
 
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