AP Apex Ultima

Apex Ultima's job is cracks. A conventional exterior paint sits rigid on the wall and splits when the plaster moves; Ultima's stretchable film moves with it and bridges hairline cracks instead of telegraphing them. Add Dirt Pick-Up Resistance to fight dust and an anti-algal package against black spotting.

This is the right answer for an older building where the plaster has begun to craze but is otherwise sound, and where the owner does not want the expense of re-plastering. For serious cracks, over 2 mm, you need Ultima Protek or proper repair first, not a thicker coat of paint.