Rawlplugs in dodgy plaster

Car body filler should work but it may not bond to the plaster if it's too powdery. You need to pack it well into the full depth of the hole, which isn't easy with that stuff. Leave it for 15 mins and drill the hole slowly without hammer action. Plugs within plugs often works in oversize holes. If you can get a size 10 plug into your hole, a size 6 plug inside that, and a no.8 screw is worth a try.

stuart noble powdery. You need to pack it well into the full depth of the hole, which

Thanks for the suggestions - will give these a try.

How about

Chris

"stuart noble" powdery. Get hold of a syringe - from a vet or off the street! - fill with a

Tony.

Omit cymru to email.

Use Rawlplug compound - the old asbestos variety. Works beautifully for this sort of job. Of course, you can't buy it these days (except in Bedminster). I still have my ancestral stash though.

Modern equivalent is a polyurethane resin. Not bad for a number of holes, expensive as a one-off.

Deep hole, large plug, long screw. Push the plug at least 1/2 inch below surface.