Silver nitrate mirror on 3d printed sla resin
My experience with glass reduced-silver mirrors is that bonding is poor, and that unprotected Ag rapidly degrades in air (a matter of days, in some cases). The bond to organic surfaces, I believe, might be worse. 

If you have access to a fairly good vacuum pump (less than 10-4 Torr), it's not hard to aluminize. Watch a demo online.

You might also request a quote from an aluminization service, such as those in this list. In 2010, a 200 mm diameter mirror was said to cost about US$70 to aluminize. This British service has an online price list, starting at £20.