I have a couple of pieces of cement come loose from when the window was replaced around 15yrs ago. I was going to remove and re-do the cement, but not to sure if I should either primer/seal the red brick with water or SBR before going ahead.
My question is would spraying with water first be good enough as buying 2.5lts SBR for such small job and not used again, and would I need to use some kind of additive to the sharp sand and cement mix to help with adhesion, as it quite a chunk on its own?

Appreciate any info, Thanks

Thanks, good advice, will do as you suggest. Many thanks