This tool should be used as a guide only. Hardtop Optima may not be an exact match for Hempaxane Classic 55000 by but we have given the closest match we can. Hardtop Optima should do the same job and have similar properties but you should always read the technical data sheets for both Hardtop Optima and Hempaxane Classic 55000 to be sure. Please see any notes to see any major differences and call us on 01285 862132 if you have any specific questions.