Could you tell please what primer is required to coat the OSB boards on a flat roof before I lay easy seal underlay. Thank you

The IKO Easyseal Underlay is applied to substrates first primed with IKOpro SA Bitumen Primer.

Further information is available within the underlay product datasheet. IKO Technical Data Sheets can be found on the individual product pages as well as in the TDS section of the website under Resources.