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How much of this are you going to have to do?
If it's just a one off get one of those massive cans from Screwfix.
https://www.screwfix.com/p/soudal-gap-filling-foam-hand-held-750ml/46137I found this Soudal one fine and the applicator worked.
If you're likely to do a lot, get a separate gun, cleaner and canisters based on the use case - e.g. Cheap, fire resistant, etc.
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could be more of a bonding plaster or standard powder filler job
hugo7
bluehuw
@HatBeard
any recommendations for specific expanding foam to fill the larger gaps between walls and ceilings where they've not bothered to make it join property and hid it with coving, will be re- covered in coving afterwards but would prefer to try and get it mostly ok behind if i can.