Blow the joint clean with compressed air or with a brushing machine, whereby a spatial separation between the cleaning work and the sealing work must be ensured. To achieve the required adhesive strength of the sealing mixture to the walls, the joint being sealed must be treated up to the upper edge with the appropriate primer.
It is recommended to also coat a strip 1 cm wide on both sides on the roadway (adhesion up to the edge). The purpose of the primer is to bind any dust on all joints and to create an adhesive layer that connects deeply with the sealing mixture being applied thereby guaranteeing an anchor to the subsurface. This is also recommended for re-cut joints and cracks. Pre-treatment of the re-cut joints and cracks with a hot air lance makes this no longer necessary.
ESTOL Joint Sealing Compound is to be melted slowly in a melting pot equipped with an agitator, thermostatically controlled burner and thermometer, until the processing temperature is reached. Boilers that do not have a mechanical stirrer are not suitable. There is a risk of over-heating the mixture when using simple bitumen melting pots of this kind with the result being that the stabilisation and tempering of the polymers and filler material in the products sink or are destroyed.
The sealing mixture should only be melted in a boiler that has been cleaned first, in other words, that is free from burnt-on residues.