Polystyrene, the Sibu Design Boards' basic material in the variants NA (non-adhesive) and SA (self-adhesive), is a thermoplastic material. Therefore, a slight expansion of the design board due to temperature change has to be considered. Bonding with PVAc - if possible - prevents this expansion and enables a flush bonding.
Depending on the design, the boards are available with different backings and support materials, which allows for different types of processing: