I had my mast surveyed two years ago and the rigger found a crack. The rigger wanted to fit a sleeve/splice in the mast but Seldon said they wouldn’t sell him the parts to carry out the repair stating they thought it was unsafe. Being an old sceptic I actually found out the name and contact details of the CEO fo Seldon in the UK. The CEO confirmed what my rigger was saying and although the repair “might” actually be stronger they were concerned if anything happened down the line they could be held liable. I’m not an expert but I’m assuming it will dpend on where the damage is on the mast. In the end I got a new mast via my insurance company. If I were you I’d talk to your insurance company, who may appoint a rigger to inspect the repair for you.