K rend

Hi all just a quick question, has any done Krend on polystyrene surface before and what best way?
You mean the ewi external wall installation.
There is on one system you can go with that's the silicone thin coat.
A base coat is applied first to 6mm beads then left for upto two weeks. Then a primer is added which will take 12 hours to dry then the next day the top coat will be trowelled on tight to which grain size you decide to go with then rubbed up with a plastic float.
There is also I a sealer that can be put on after to preserve the work hope this helps