letter no. 1
Why is the paint bubbling on my wall near the coast?
the desk replies — Blistering is almost always moisture in the wall turning to vapour and pushing the paint film off — from humid sea air, a plumbing or AC leak, or rising damp. Repainting over the bubbles without finding the moisture source guarantees they return. Fix the leak first if there is one, then repaint over a properly dried, primed surface with a damp-tolerant system.