Firstly let me say, I am sorry to hear that you separated from your wife. Whilst I understand it is important to have harmony in the bedroom department (or in the wheelie bin), I am not surprised.
You are 100% right in saying it takes courage to discuss this with your 'other half'. I suspect 99.9% of us don't have that balls.
Very few women seem to understand trashcan fetishism, let alone like it.
I wish more people were understanding that it is neither unusual nor odd. It is about power-play. It is about releasing authority to your partner (if you are the one in the wheelie bin). It is linked to encasement fetish. It is linked to feeling the touch of polythene on your skin. It is about objectification, to have her do what she likes to you.
I hope you meet someone you can share this part of your life with, and better still patch it up with the missus. Explain how it took courage. Show her that the elements listed above are normal. Talk it through.
I wish you well. Good luck.