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Old 05-19-2020, 08:44 AM
Maxrate Maxrate is offline
Join Date: Dec 2008
Location: League city, TX
Posts: 522
Default Fast curing fiberglass

Wow is all I can say! I ran across this EAA video that everyone working with glass may want to check out. If youre a member logon to hints for homebuilders. Select fiberglass, and look for the fast curing fiberglass video. Im currently working on the wheel pants/fairings and was having to wait 5 to 6 hours to complete a task while waiting for the epoxy to cure. I set up a large shipping box with a space heater set to 87 With 1 holes for venting and cut the curing time down to one hour.
Mark Malone, RV7
Wings complete, SB 14 complied with, canopy and cowling in progress, Up on the gear.
N442MM reserved

2020 Donation gladly paid..
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Old 05-19-2020, 11:38 AM
wirejock's Avatar
wirejock wirejock is offline
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,679
Default Curing epoxy

I'm fortunate to have a heating system room. Stays 90 most of the time. I hang any part that fits inside. It's actually very useful. Part set up before materials can flow.
Larry Larson
Estes Park, CO
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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Old 05-20-2020, 06:51 AM
Southern Pete Southern Pete is online now
Join Date: Jul 2015
Location: England
Posts: 57

Fast cure usually means low strength...
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Old 05-20-2020, 07:36 AM
PhatRV PhatRV is offline
Join Date: Mar 2018
Location: Buena Park, California
Posts: 182

Originally Posted by Southern Pete View Post
Fast cure usually means low strength...
What you are referring to is related to the hobby store epoxy that is marked as 5min/10min/30min where the 30min variety makes a stronger bond. The laminating epoxy we use in aerospace structure cure time is dependent on the temperature of the composite layup. Most laminating epoxy systems have a working temperature range where as too low temperature will not get the epoxy to cure and too high temperature will cause the epoxy to degrade. However, this high range is really high, it will burn your skin. For experimental stuff, anything in the range of a thermal blanket set on high is perfectly okay. In the commercial aerospace composite autoclave, the temperature setting is even higher. 90degF is even less than your skin temperature and it will not degrade your composite strength at all.
RV8 standard build: Empennage 99% completed
Wing -- Closed
Fuselage -- Interior work
Avionics Installation -- started

Donation paid through 2020
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