After a lot of thought, do we soda blast, bead blast, slurry blast, two pack, bituman, comastic? We finally decided to clean back as much as possible fo the two pack, then use comastic. It seems a bit less brittle and adheres well. The two pack did us for over 5 years so not too bad but where it did get scrapped it allowed water in where it flaked off. So we will see how the Comastic goes . We have had the work done at the new, though over 200 year old, dry dock at Bank Hall in Burnley. Fabulaous facility and Brian and Les are really helpful.