Just a warning for everyone.... I've bought four packages of Great Planes Pro Epoxies over the last 2 years, two of the 6 min and two of the 30 min. I wanted to have some as spares.All four packages are still in their original packaging, unopened. The resin component has gelled (hardened) in in every package. I've had bottles of epoxies last for years and years, this is a first. You might want to buy a different brand until they can fix this shelf life issue.