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armywrights(at)adelphia.n
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 Posted: Tue Mar 07, 2006 7:42 pm Post subject: epoxy and gelcoat |
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Just started working on the emp fairings. My VS fairing has plenty of pinholes in the gelcoat, and some other areas need worked out as well. I’m using West System 105/206 resin/hardener. Will I need to completely remove all gelcoat before I use the epoxy, or after I sand down and clean the surface will the epoxy make a good mechanical bond to the exposed fiberglass as well as the nearby gelcoat?
Rob
#392
Emp fairings – QB fuse and wings due in April!
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dmasys(at)cox.net
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| Posted: Tue Mar 07, 2006 7:57 pm Post subject: epoxy and gelcoat |
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A light sanding of those gelcoated parts, followed by a scrub-on coat of West Epoxy diluted 1:1 with acetone, will fill many of the pinholes. This is what Van's recommends. Let the epoxy cure a few days, sand it lightly, then add coat of a filler like "UV smooth prime" (available from ACS) either sprayed, brushed or even rolled on. Wet sand that down and it makes a near-perfect pinhole-less surface for subsequent painting.
Did that on the entire cowl for my -7A and it looks great 2.5 years later, even with all of the heating and stresses cowls get. The white gel-coated parts are even easier to get to a paintable stage.
-Dan Masys
#40448 N104LD reserved
| Quote: | From: "Robert G. Wright" <armywrights(at)adelphia.net>
Date: 2006/03/07 Tue PM 10:41:31 EST
To: <rv10-list(at)matronics.com>
Subject: epoxy and gelcoat
Just started working on the emp fairings. My VS fairing has plenty of
pinholes in the gelcoat, and some other areas need worked out as well. I'm
using West System 105/206 resin/hardener. Will I need to completely remove
all gelcoat before I use the epoxy, or after I sand down and clean the
surface will the epoxy make a good mechanical bond to the exposed fiberglass
as well as the nearby gelcoat?
Rob
#392
Emp fairings - QB fuse and wings due in April!
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dlm46007(at)cox.net
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| Posted: Wed Mar 08, 2006 6:06 am Post subject: epoxy and gelcoat |
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Another tip. When you get to the step to rivet on the hinge for the cowl,
consider putting a 1" strip of E-glass over the rivet line after attaching
the hinge. This will prevent the rivet heads from working their way through
the paint after a couple of hundred hours.
---
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