Everbuild resiblock indian sandstone sealer colour enhancer everbuild rbindenh5 resiblock is europes leading specialist in block paving sealers and is now available from everbuild resiblock indian sandstone sealer colour enhancer restores the stone and helps to bring out its natural colours providing long term resistance against staining and algae growth and lasts up to five years the application can be done in one simple coat and is suitable to use with most forms of natural stone