Start With the Component, Not the Cleaning Routine
Mold on a wet palette is not one problem with one fix. Paper, foam, and tray have different cleaning limits and replacement rules; separate the parts and find where growth is.
A wet palette is meant to stay damp while you paint; that hydration is not a hygiene failure. Water added for a session differs from water left standing on cleaned, stored parts. Judge the setup by what is growing on it, not by water during normal use. Still choosing a product? That buying decision is covered in our guide to the best wet palette for miniature painting.
What to Clean and When to Replace It
Component | What to do | Limit or exception |
|---|---|---|
Used paper | Remove before cleaning; use new suitable paper. | Staining or paint residue does not prove the foam is moldy. |
Foam pad | Discard foam with visible growth. For foam without mold, use the cited Redgrass method below (mild soap and warm water), rinse well, and air-dry before reuse. | No strong chemicals. Replacing foam when growth is uncertain is conservative advice, not a certification. |
Tray and lid | Wash as the maker allows; Redgrass permits hand-washing or dishwashing its own tray and lid. | Other makers' foam and dishwasher compatibility is not verified here. |
Staining is common with acrylics, so color alone is not evidence of mold. Visible growth, or growth that returns after cleaning, is the practical signal; no species identification is needed. If the pad looks wrong and you cannot tell why, replace it.
What the Current Redgrass Guidance Says
Redgrass's wet palette mold guidance covers its own tray, lid, and foam: discard moldy foam, clean foam without mold with mild soap and warm water rather than stronger agents, and hand-wash or dishwash the tray and lid as that maker permits.
Treat it as a Redgrass procedure, not a universal rule. Other palettes use different foams, papers, and plastics; follow their makers' instructions rather than assuming a plastic-safe cleaner is foam-safe.
Stains, Smell, and the Limits of Diagnosis
Paint stains alone do not prove mold. Acrylics leave permanent color in foam and paper, and a dark patch under a dried mix may be cured paint. A clean tray is not proof the foam is sound, and smell is not a test.
If paint looks thin, runny, or refuses to hold a bead, that is a water-loading question, not a mold diagnosis; see wet palette paint too watery. For foam with actual or uncertain growth, replace it rather than running a home chemical experiment. Do not boil the foam, scrub with wire, add copper coins, or apply bleach, alcohol, ammonia, peroxide, or mixed cleaners.
A Practical Clean-and-Recheck Sequence
- Remove the used paper and dispose of it.
- Handle suspect foam without disturbing it; bag it rather than rinsing growth into the sink.
- Wash the tray and lid as the maker allows, then rinse thoroughly.
- Let cleaned parts dry between sessions before storage; that is not a rule against wet use while painting.
- Fit new paper and replacement foam where needed, then rehydrate and assemble exactly as the maker instructs.
A damp working tray is normal. Inspect for growth on the foam or residue left after cleaning, not for water during a session.
Prevention and Recheck Checklist
A stronger cleaner is not the answer: change rinse water, clean the container each session, and clean brushes before use. Let the foam air dry before reuse; cooler room conditions help if you control them. Distilled or deionized water may help in some regions but is generally unnecessary where tap water is potable. A closed lid or antimicrobial claim is risk reduction, not a mold-proof guarantee.
Recheck before each session: fresh rinse water, clean brushes, no visible growth, clean stored parts, and new paper. If growth returns after a proper clean, replace the foam instead of escalating the cleaning chemistry.
