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18th March 2015, 08:11 PM #1Hammer Head
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filler / bulk add for boat craft epoxy
got boat craft epoxy to use for coating over ply but I was thinking I can use it to do some glueing here and there but need a bulka to thicken it up any ideas?
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18th March 2015 08:11 PM # ADSGoogle Adsense Advertisement
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18th March 2015, 08:15 PM #2
Flour, sawdust, talc, aluminium powder, sand...
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18th March 2015, 08:21 PM #3Hammer Head
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Flour as in plain flour ?
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18th March 2015, 10:23 PM #4
Yep. Plain or wholemeal or.....! Also dry coffee grounds, graphite powder, iron oxide(s), and sanding dust from inside the bag of your sander! Crushed granite, kitty litter, chalk dust, cement...
(not to mention the proprietary fillers)
Apparently, fragranced talc smells nice when you sand it...
Silicon carbide powder for that person you don't like who'll be sanding it himself...
On teh intarwebs, the US contingent tent to scoff at the use of non proprietary fillers in epoxy; but if they were paying what non-US people have to pay (what they pay $14 for, we pay $50 for) they might see why...
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19th March 2015, 10:24 AM #5
As MS said, you can use pretty much anything as a filler. I personally have used flour, wood dust/fibre and cement oxides (i.e. oxide colour additives for cement).
I also bought some phenolic microballoons (see here) that I used for some below waterline filling.Cheers.
Vernon.
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Bite off more than you can chew and then chew like crazy.
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19th March 2015, 10:58 AM #6Hammer Head
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Thanks guys might use base coat (plaster compund ) got heap of it here
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19th March 2015, 11:45 AM #7SENIOR MEMBER
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Colloidal silica is normally used as a thickener (such as West systems 406)
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19th March 2015, 02:58 PM #8
I use the Bote Cote fillers. While there is a cost, I can be sure of consistent texture and finish.
I would also have concerns about what some products might do to the strength / flexibility etc of the finished product. With the proprietary product, I don't need to be the scientist.
Cheers, Mark
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19th March 2015, 05:10 PM #9
Apparently, epoxy-granite mix makes a good "I can't afford a cast iron pour for my machine tool casting" alternative.
And (wheat) flour has PAR's nod of approval. Talc is good if you are looking for easy sanding.
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20th March 2015, 11:59 AM #10
The trick with fillers is to use the ones you need to provide the physical properties you want. Talc, for example, will make things easy to sand, though not as light as other stuff, it's cheap and readily available. Flour (yep the cooking stuff) works just as well as purchased wood flour. Sander dust usually makes a very coarse thickened mixture, so it shouldn't be used where you need to see it and it's not easy to sand, particularly compared to cooking flour. Torn up paper towels and toilet tissue works good too, but can also be harder to sand and can make for lumpy fillets. Stone dust works very well and I use it on centerboard leading edges for protection, but pray you don't have to sand it into shape, once cured. Iron fillings works fairly well, but what works much better is printer toner (iron dust and some other junk), as it's much finer and more consistent.
You can put just about anything in goo to stiffen it up. If in doubt, do a set of simple tests with a base line and several "versions" of you mixtures. Bend them, break them and remember how well they applied, then make a list of each attribute.
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