ISO-TOP SPRAY PRIMER is a material for pre-treating surfaces to be bonded. It creates an optimum bonding surface for window connection foils, joint sealing tapes and multi-functional joint sealing tapes. Weathering or the roughness of substrates can often make it difficult to create an air tight bond for window connection foils. This unevenness can be optimised by pre-treating with ISO-TOP SPRAY PRIMER. The primer is applied in just one burst of spray. After waiting a short time for the solvent to evaporate, the foil can be applied.