The glass in an external wooden window frame is cracked and needs replacing.
The putty at the bottom of the frame is cracking and easy to remove but the
at the top and sides is rock solid. What is the best way to remove hard set
without damaging the wooden frame?
Agreed - and to add to Phil L's advice, use gloves and googles  and put a
large dustsheet down to catch the broken shards, and empty this straight
into the wheelie bin when done.
As for preventing damage to the frame - almost impossible with hard putty
that's stuck well into the frame. When used to do the job, I simply took my
time and filled in any damage when applying and finishing the putty, and
then touched up the paintwork.
 I'm not a health and safety 'nut', but a splinter of glass in an eye
and cuts to the fingers are bloody painful - believe me!
On Sat, 24 Mar 2012 08:27:25 +0000, Alt Beer wrote:
I used a straightedge with a knife to create a groove along the seam,
then a putty knife placed in the groove and gently tapped with a hammer
worked well to lift the old putty. Then take the glass out and clean up
the frame edges before priming.
i have always used an old finger pointing trowel, using a blow lamp heat
up the trowel and hold the trowel on the putty for a few mins , then using
a putty knife pare the old putty out . this method has never failed me no
matter how old the putty was
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