I just built these mirror frames out of 2x4 sheets of fine 3/4" Borgian MDF.
I got ready to route the rabbets in the back to accept the mirrored glass
and realized that I hadn't given much thought to HOW I was going to actually
attach the glass. So, before I tear into it, please comment on the following
1. The rabbet leaves 5/8" surface onto which the glass will bear. Considered
cleaning the glass really well and simply using an epoxy to bond it to the
MDF. Never used MDF before and I'm not too sure how well it will bond to the
2. Considered cutting a few 3/16 holes in the glass with a glass-cutting bit
and affixing with flat head screws and nylon washers.
3. Also considered [your suggestions here!]
Thanks a waht!
No epoxy! Use silicone caulk instead. It will remain flexible, whereas
epoxy will break the glass when your MDF frame flexes.
I would probably cut a tempered hardboard backer the same size as the glass,
mostly to protect the back of the mirror from scratches, then clamp it in
place with a few strategically located hardboard clips. Just cut some
hardboard pieces on an appropriate size, drill a hole in each near one edge,
and screw these into the MDF adjacent to the rabbet with the long side of
the clip extending over the glass/backerboard.
The mastic is probably intended for mounting plate mirrors on walls when
visible fasteners are not wanted. Nothing wrong with using it for the OPs
project, but not worth getting a special product IMO.
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