Sikaflex 522 Caravan. Sikaflex 522 is a low emission 1 x component Silane Terminated Polymer sealant and 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. Sold in singles or BG170-12 Outer Boxes x 12. Sikaflex is a trade mark of Sika Limited.