>… I really don’t understand why people think that epoxy resin thickened with >stuff to bring it to the consistency of putty is better to use than epoxy >putty designed for the purpose. They are equally hard and equally stiff.
I custom mix my own “bondo” using West Systems epoxy and 6 to 8 different fillers (all different densities) for cosmetic filling where there might be a load (under hardware) or where extra thickness is required. I also use Cab-o-Sil for a thickener and/or anti slumping agent. I use the “off the shelf” epoxy fillers for the top layers just before the repair is ready for primer. It is easier to sand and spreads smoother than my custom mixes. I do not use polyester based “off the shelf” fillers especially those intended for automotive repairs. Most inexpensive polyester resins have an affinity for water and over time will absorb some into the filler. Back in my autobody repair days I would find rust under bondo filler that was relatively recent. Best regards, Martin Calypso 1971 C&C 43 Seattle From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Dave Syer via CnC-List Sent: Tuesday, November 24, 2015 6:08 AM To: David Knecht; cnc-list@cnc-list.com Cc: Dave Syer Subject: Re: Stus-List Subject: Re: Keel repair In my case, was not suggesting it is superior, I just prefer to purchase the raw materials. This way, I can use unfilled as a first coat, make a putty for the fill, and laminate at the end. Same epoxy, sometimes even the same batch for multiple applications/jobs. YMMV. Dave On Tue, Nov 24, 2015 at 8:49 AM, David Knecht <davidakne...@gmail.com<mailto:davidakne...@gmail.com>> wrote: I really don’t understand why people think that epoxy resin thickened with stuff to bring it to the consistency of putty is better to use than epoxy putty designed for the purpose. They are equally hard and equally stiff. Am I missing something? Dave Aries 1990 C&C 34+ New London, CT [cid:image001.png@01D126A5.5942BBA0]
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