Blotchy Water Soluble Spots on Latex Paint: Leaching

Blotchy Water Soluble Spots on Latex Paint: Leaching
Definition: Blotchy usually tan colored glossy water soluble spots on latex paint

- Painting in cool humid conditions or just prior to their occurence, such as late afternoon or just before or just after rain
- If moisture from any source collects on fresh paint before it has thoroughly dried, leaching may appear

- No painting if temperatures are below 50 degrees or late PM when it is cooler
- Coolness extends drying
- Surfactants that usually evaporate rise to the surface
- The residue disappears from weathering in about a month and doesn't harm the paint
- It is best to let nature take it's course, but rinsing sometimes will easily remove residue
- Leaching cures itself in a little time
- Surfactants are necessary to a paint formula. They evaporate and never are a part of the dried paint
- Slow drying due to coolness or humidity, prevents the surfactants from evaporating and a blotchy sometimes glossy residue appears