30 minute epoxy & alcohol?
01-02-2017, 03:44 PM
#26
Senior Member
Join Date: Nov 2005
Location: Newton, KS
Posts: 262
Likes: 0
Received 0 Likes
on
0 Posts
That may be true for many epoxies, but not all. This is from the West Systems C&P above:
207 Special Clear Hardener was especially developed for use with West System 105 resin in coating applications where an exceptionally clear moisture-resistant natural wood finish is desired.Improved formula chemistry allows for true clear cure with same UV stability without amber tint. An ultraviolet inhibiting additive improves the resistance of a West System 105/207 mixture to sunlight but the cured epoxy surface will still require the additional protection of a quality UV-filtering varnish.
I know, the last line says to use a a UV filtering varnish for better protection but, in the 30+ years I've been involved with racing scale hydroplanes, I've never heard anyone say they had issues with West Systems epoxy. In fact, the only one I can say I've had issues with was Z-Poxy. I found it to be very brittle when used to coat a boat hull as opposed to WS. I also found WS to be easy to sand with an electric DA as well as sanding bars
207 Special Clear Hardener was especially developed for use with West System 105 resin in coating applications where an exceptionally clear moisture-resistant natural wood finish is desired.Improved formula chemistry allows for true clear cure with same UV stability without amber tint. An ultraviolet inhibiting additive improves the resistance of a West System 105/207 mixture to sunlight but the cured epoxy surface will still require the additional protection of a quality UV-filtering varnish.
I know, the last line says to use a a UV filtering varnish for better protection but, in the 30+ years I've been involved with racing scale hydroplanes, I've never heard anyone say they had issues with West Systems epoxy. In fact, the only one I can say I've had issues with was Z-Poxy. I found it to be very brittle when used to coat a boat hull as opposed to WS. I also found WS to be easy to sand with an electric DA as well as sanding bars
04-08-2017, 07:03 PM
#27
Junior Member
Join Date: Apr 2014
Posts: 26
Likes: 0
Received 0 Likes
on
0 Posts
I recall laminating resin does not contain a sealing wax whereas finishing resin does so remember if applying finish resin over laminating alway abrade the surface and wipe with acetone or MEK. You may wish to view the AR-5 fuselage video it's long over an hour an well worth it. BTW the AR-5 broke a world speed record at 213 mph on 60 Hp 2 stroke water cooled engine with a verified flat plate surface < 1 sq/ft also a record considering it was a manned airplane. https://www.youtube.com/watch?v=qStFDcZs5Og
live long and prosper Ed
live long and prosper Ed
