A composition containing a polymer, a crosslinker and a photo-activatable catalyst is placed on a substrate. sulphur dioxide is separated from the off-gas by way of at least one first scrubber stage by means of ammonia or ammonium compounds, 2. With repair consideration, mixing may be used to improve upon the performance of a coding solution. The tissue shaper comprises a pair of hingedly coupled first and second arms for receiving the stomach tissue there between.