Sash windows help - trowel mastic?

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Hi, I need some advice....

Am repairing the outsides of some of our original sash windows. Some areas where the frame meets the sandstone have paint coming away and the red sandy material beneath is crumbling. I removed the poor sections with a view to replacing then repainting.

I had bought cromar trowel mastic which i assumed would be the stuff (to be honest it was the only trowel mastic i could see anywhere), but upon opening its not ideal to fill large gaps. Is it actually some sort of linseed/burnt sand mix that was used on these windows initially? If so, can this be obtained? Is there anything more suitable as a modern alternative?

I need to fill some inch gaps with something stiff enough that I can shape to form a nice 45 degree angle from the frame to the stone.
 
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