Measure the mirror and decide how you want the frame to fit. Use a chop saw (I wish!) or miter box to cut 45 degree angles -- to piece the frame together.
I've Been Framed!!
My builder-grade mirror was terrible. Not only did it look cheap, but had some chips on the edges. Since I re-did my bathroom on a budget (see my other posted project!)
https://www.hometalk.com/44341071/inexpensive-bathroom-re-do-in-the-colorado-mountains?cid=8491359%3Fcid%3D8491359 ---tell me what you think! :-)
...I did an inexpensive "fix" for the mirror. Here are my steps.
The mirror had raised "diamond" plastic screw-in clips to attach it to the wall. I had to find a way to accommodate the back of the frame.
I took course sandpaper and smoothed down as much as I could -- without compromising the integrity of the clip.
I used brown craft paint to dot each clip. I used the wet paint in the following way...
You can see the brown paint dots... where I would have to hollow out the trim... to make it flush with the mirror.
...to cut a rectangle around each brown spot
I used a hammer and 1/4" chisel.
I chiseled out an area that would accommodate the mirror clip(s)
...hollowed out -- and ready for mounting
FYI: you DO have to paint the back of the trim... It's for a MIRROR!!
I used only one tube for the entire four sides of the mirror.
The Liquid Nails needed to dry for 4-6 hours. I used blue tape to secure to mirror.
(then I went to bed)
...green tape too! ;-)
OK... I am not hiding anything! My miter was not perfect. ...and I needed to sand down a glop of paint on edge... then fill the seam with some caulk (or wood filler.) Repaint area if necessary. (It was!)
I also caulked between the inside frame edge and mirror... just to smooth things out. ...then, once dry, I (later) used a razor blade to give a clean line of caulk.
O.M.G. (see my project on the completion of this bathroom!) "Inexpensive Bathroom Re-Do"