I'm grateful for all help, BillR - yours included, which has been amongst the most useful here. But, let's be honest, I don't know what kind of response you expected from a posting suggesting somebody was so stupid that they don't know what a pane of glass is, but I think mine was quite tame compared to some you might have got.
I'd love to see what you'd get if you asked for mastic in a BMs. It's rather a broad term.
The normal stuff to seal a non structural gap and waterproof it between differing materials is silicone for outdoor use. You can get it in several colours and clear.
In article , Nathan Thompson writes
Maybe avoid the grease, it might compromise the mastic/silicone seal applied after. A bit of thin plastic or cling film pushed in by the ply or wrapped around it might serve you better.
Not relevant for the course you've chosen, but a lot of sash and case windows of old were sealed with mastic mortar; it has sand in so is sort of mortar like, but has some sticky mastic content. Not stunning, and best left in the 19th century, your soln sounds better. I take it you've seen the proprietary 'frame sealants' in B&Q etc, not quite the feel of silicone (more resilient), but maybe have that as a base (or acrylic?).
In message , Nathan Thompson writes
That 'putty' is probably the old non setting mastic that used to skin over and leave a flexible sticky core (green-white colour).
Rake out all the mastic, mortar etc. and spray the frames and the walls (in the gap betwixt frame and masonry with water. Fill the gap with expanding foam and leave it for a few hours. Cut off the bits sticking out flush with the front of the frame, point up with a fillet of waterproofed mortar (colour to suit existing) so that you just cover the edge of the wooden frame. When the mortar is dry apply a bead of polysulfide mastic between your new fillet and the woodwork.
Can someone tell me how I make any money out of this? If I tell everyone how to do it themselves will they ever ask me to do anything for them?
Serious question.
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