Sika® Primer-290 DC is a solvent-based colorless to slightly yellow primer, which reacts with moisture and forms a thin layer. This layer acts as a link between substrates and adhesive/sealant. Sika® Primer-290 DC is specifically formulated for the treatment of timber decking strips prior to caulking with Sikaflex®-290 DC or bonding with Sikaflex®-298.

Ideal application and surface temperature are between 15 °C and 25 °C.