trying to make red icing but not getting a real good red used almost a whole bottle of wilton any suggeston's.

ANot sure what shade u currently have but buttercream will get darker automatically it's exposed for a while.

Make sure to use No Taste Red!

To get a really deep red I add brown.  Depending on the cake I sometimes just add cocoa powder.  Always make it at least a few hours in advance (or over night) to let the color mature.