This tool should be used as a guide only. Barrier may not be an exact match for Sigmazinc 109 HS by but we have given the closest match we can. Barrier should do the same job and have similar properties but you should always read the technical data sheets for both Barrier and Sigmazinc 109 HS to be sure. Please see any notes to see any major differences and call us on 01285 862132 if you have any specific questions.