Sikaflex **NEW** 522 Caravan. Sikaflex?-522 is a low emission 1-component Silane Terminated Polymer sealant/adhesive. It has a high weathering and mould resistance. Sikaflex?-522 meets highest EHS standards. It bonds well to a wide range of substrates with minimal pre-treatment. ?High ageing and weathering resistant. High fungicidal resistance. Very low emission and odour.