How do I avoid condensation stains?

Choose delivery with assembly, or assemble your greenhouse yourself as soon as possible after delivery, to reduce the risk of condensation stains during storage. Can’t do it right away? Then unpack your greenhouse build kit anyway, store the profiles dry and well ventilated, place dry slats between stacked parts, and choose a spot with a stable temperature. Once your greenhouse is up, ventilate it well, because a closed greenhouse works just like sealed packaging. Or choose a coloured finish: with powder coating, there is no chance of condensation stains.