This tool should be used as a guide only. Penguard HB may not be an exact match for Carboline 888 Primer by but we have given the closest match we can. Penguard HB should do the same job and have similar properties but you should always read the technical data sheets for both Penguard HB and Carboline 888 Primer to be sure. Please see any notes to see any major differences and call us on 01285 862132 if you have any specific questions.