Talc?

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dbullmoose
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Talc?

Post by dbullmoose » Mon Nov 04, 2019 10:57 am

Sorry if this is a repeated question. I have read that talc can be used as an epoxy filler. I have come across a tire shop that can sell me a large quantity for cheap. Can "Tire Talc" be used as a filler for fillets, and what are the pros and cons of using it compared to wood flour or silica?

Thanks!



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Capt UB
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Re: Talc?

Post by Capt UB » Mon Nov 04, 2019 11:50 am

dbullmoose wrote:
Mon Nov 04, 2019 10:57 am
Sorry if this is a repeated question. I have read that talc can be used as an epoxy filler. I have come across a tire shop that can sell me a large quantity for cheap. Can "Tire Talc" be used as a filler for fillets, and what are the pros and cons of using it compared to wood flour or silica?

Thanks!

""Talc
Cost-Effective Filler for Sanding
Talc is a component in most body fillers, and is often added for fairing and smoothing the finish of fiberglass laminations. It provides a unique balance of opacity, film reinforcement, and both anti-cracking and barrier properties as part of a surface layer. This filler is compatible with epoxy, polyester, and vinyl ester resin systems. Mix ratio is 2:1 (filler to resin by volume).""

Looks like it would be the last coat, "fairing and smoothing the finish", I would not use it for fillets, they are structural.

BBC sells wood flour, 5 lbs. $ 20.00...
Wood flour is very fine, filtered, sawdust-like wood by-product. It is an excellent all around filler for creating glues and structural fillets. Use in sewn-seam and stitch and glue construction. Wood flour combines with epoxy to make a non sagging fillet.

I must have 20 lbs. of wood flour, great for everything....
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Evan_Gatehouse
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Re: Talc?

Post by Evan_Gatehouse » Mon Nov 04, 2019 9:40 pm

Talc is OK for final fairing, but never for fillets. It's the main thickener in Bondo.
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dbullmoose
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Re: Talc?

Post by dbullmoose » Tue Nov 05, 2019 10:17 am

Thanks for the advice !

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