This is another post about SBR I'm not 100% sure but I'm pretty sure a lot of people are using SBR in the wrong way. I was on a job a while back and the plasterer who's job it was insisted on me using the SBR over his sand and cement before I skimmed it.
Yep, that was the reason the job failed out! The customer wanted Wetherby adhesive and silicon top coat- cheaper , but I couldn't risk it and told him to find someone else.The job was at the back of the house, yours is a garage wit a door that creates a lot of vibes and banging, so whatever you decide to do must be spot on.I did look at that. Costly by looks of.it and ive got to match the same on otherwalls