Straightness of steel/alumunium box section

[Jonathan]

It will be better to use a thixotropic or fairly viscous variant than the west system stuff which is designed to wet out composites and is a pretty thin liquid.... It'll be at least a couple of months before I get to that stage so I'm looking forward to reading how you get on

Something like gelcoat then?

Just been to the local fasteners shop so now I can get these rails fixed down. I'm going to just try it without epoxy first and see what happens.

[FatFreddie]

Something like gelcoat then?

Gelcoat is usually polyester and relatively weak, I was thinking of one of the thixotropic epoxys like the 2015 you originally mentioned - the west system stuff is very good but rather thin for this application.