This tool should be used as a guide only. Vinyguard Silvergrey 88 may not be an exact match for Sigma Vikote 15 by but we have given the closest match we can. Vinyguard Silvergrey 88 should do the same job and have similar properties but you should always read the technical data sheets for both Vinyguard Silvergrey 88 and Sigma Vikote 15 to be sure. Please see any notes to see any major differences and call us on 01285 862132 if you have any specific questions.