Normally in a picture frame the glass is held in front by the frame rebate.
A back (of thin hardboard, thin mdf of thick card) holds the glass and
picture/mount assembly in place and this back is secured by tacks.
Depending on whether you have a lot of small insects in your area, you may
wish to put DS tape in the rebate before fitting the glass to seal it.
If you had a lot to do, it would be worth using a glaziers tack hammer,
which looks similar to a large office stapler, but which fires small flat
triangular or diamond-shaped tacks. Pro framers use these and it makes the
job quick and safe (in that you're unlikely to break the glass)
On a smaller scale, you can buy a pin-pusher device, which holds small pins.
You'd lay your picture face down with the side to be nailed against a robust
fence (a bit of 2 x 2 clamped to the bench) and simply push the pins into
the frame sideways, leaving a little of the head showing to hold the back in
If you're doing a one-off, then you could use small panel pins (almost
headless nails) instead, with a small hammer and a pin punch, with a similar
fence arrangement. You need to be careful that you're putting the pin in
almost dead horizontally - too much of an angle down and you run the risk of
fracturing the glass. Start the pins first by pushing them into the frame
with pliers, since there isn't really enough room to hold them with your
Once the back is secured, you'd tape over the frame-back joint all round to
seal the frame and hide the pins.
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