I've partway through a multi-weekend project involving turning two free-standing metal shelving units into a fully enclosed workshop-cupboard. The enclosing material is MDF and since this will be on my balcony, the MDF needs some weather-protection. So I'm painting it.
Naturally, I don't have space to use a while 2L tin of paint in one session. After a second extended washing of the roller tray, I was wondering whether putting cling-wrap over it for a week would be a good idea, not only saving sending the surplus paint down the drain, but also saving me 20 minutes of washing the thing. And is a week too long to expect the paint to still be usable?