This tool should be used as a guide only. Penguard HB may not be an exact match for Carboline 187 HBF Primer by Carboline 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 Carboline 187 HBF Primer to be sure. Please see any notes to see any major differences and call us on 01285 862 132 if you have any specific questions.