Can anyone ID this capacitor type ?

[chopstuck]

This is a 1uf 100v cap in my Yamaha T50.
Roberto had recommended changing these to a poly type cap.
(Just which type he didn't say).
This is what I found in my amp.
Any guesses to what composition it is ?
It's rectangular and dipped in pretty blue gook.

[diagrammatiks]

that's already a film capacitor.

[chopstuck]

Thanks, my amp has been worked on before and it's sometimes difficult to see what's been changed.

[diagrammatiks]

it's an epcos b32592 metalized polyester.