Basic differences between softex/devils sauce
Thinner viscosity, seems to penetrate fibres better rather than lay up just on the surface.
I think it cures 'clearer'. not as opague as softex.
You can mix it yourself as it's Red Devil clear acrylic caulk mixed with toluene (sp).
Not as good as softex for setting eyes, I used goop to set the eyes and then apply the D/S both on the surface and by pushing into the fibres.
Either material has some bad 'stuff' in it that you need to be cautious with. ( Last night I spilled some CA "Kicker" on my workbench when doing some crease flies, had to evacuate! )