>     I've used BIN before. Seemed kind of thin.

I am not familiar with BIN, but you've hit on a common mistake of
inexperienced painters.   Good primers "should be thin."  This allows them
to soak into the wood grain and "seal & bond" more effectively.  Many
hardware primers need to be thinned down a bit.  The primary purpose of a
primer is not to cover over things (ie. blemishes, etc.) as commonly
thought,  that is supposed to be a secondary function.

FYI

David Tharle
Ardmore, AB
Canada