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Plastic bags are particularly useful when it comes to storing rollers for a period of time - be it overnight, for days or even weeks. The best ones for rollers are those made of thinner material like you find in the fruit and veg department of a supermarket. Blow into the bag to open it and carefully insert the roller or rollers. They do not have to be removed from the frame. Wind the open end of the bag around the roller frame to prevent air getting in. Brushes covered with water-based emulsion paint can be stored this way too.
 
Trays with emulsion paint still in them will keep overnight if inserted into a plastic bag of heavier material. This helps stop a skin forming on the surface of the paint. The bag does not have to be tied but pull it taut across the top of the tray to stop it dipping into the paint. Next day just remove the tray carefully, take your rollers and brushes out of their bags and you’re ready to start again. This saves a lot of cleanup time when jobs can’t be completed in one go. | 
