I need a resin cement to use for cementation of posts. It needs to bond both to fiber and metal posts, and also to dentin. What product do you recommend?

Multilink Automix (Ivoclar Vivadent) is an excellent choice for post cementation. It is dual-cured, with a self-cured adhesive to work well in the post space. The kit also contains a metal primer to use on metal posts. The self-mixing tip is perfect for extruding cement into the post space. The cement comes in three shades and can be used for adhesive cementation of metal-ceramic and all-ceramic restorations as well as for posts.