K-rend on concrete

[Ashleyscoob]

Got a small k-rend job it's on 30 years old concrete which is round a window is it best to prime firstbefore applying base coat was going to use hp12 base With mesh or is there a better base coat to use

 

[Ashleyscoob]

Would plasprime x work as a primer ?

 

[warriorupnorth]

Use the hp