First time doing fin plugs. For fcs fusion and using epoxy quick do I need to add anything to the mixture like cab-o-sil or is the quick epoxy ok?

Straight resin on the plug and routed hole. We pour a the routed hole about 1/4 the depth and brush resin up the sides of the walls.

Then take the rest of the resin from the bottom of the routed hole and paint the bottom and sides of the fusion plug before setting it it. 

Squeegee around any excess resin to prevent bumps in your lamination.