This tool should be used as a guide only. Jotamastic SF may not be an exact match for Interbond 998PB by but we have given the closest match we can. Jotamastic SF should do the same job and have similar properties but you should always read the technical data sheets for both Jotamastic SF and Interbond 998PB to be sure. Please see any notes to see any major differences and call us on 01285 862132 if you have any specific questions.