plastering crack

Im a bit concerned about applying bonding directly over a steel lintel holding up an RSJ in regard to cracking... Is there a trick to it or some mesh or a product that is good for these sort of scenarios where movement between 2 different substrates? Really trying to minimize cracking in the...

Hi, We had our entire flat freshly plastered a couple of years ago, but pretty much every room now has hairline cracks. The worst ones are probably in the ceiling. But even still, they are not terribly deep. I've seen a few youtube videos which advise making the crack deeper first with a...