The Mijello plastic palette and the Jackson's porcelain palettes are good solutions to keep acrylic paint wet on your palette to come back later and paint.
Acrylic Palettes that Keep Acrylic Paint Wet - Jackson's Art Blog
Daler Rowney : Stay Wet Palette with lid large 20x11in 3 sheets reservoir paper & 12 sheets membrane..
Daler Rowney : Stay Wet Palette With Lid : Large : 20x11in
Invincible' Stag painting by Sarah Taylor
Two Painters Try Jackson's Artist Acrylic Paint - Jackson's Art Blog
Paint Palettes & Accessories
Masterson : Sta-Wet Super Pro Palette : 40x30cm
Steve McGarrett – An Officer And A Gentleman Alex O´Loughlin An Intense Study
Two Painters Try Jackson's Artist Acrylic Paint - Jackson's Art Blog
Improve Your Painting: 36 Acrylic Painting Techniques –
Colour Mixing: Eight Reds in Six Restricted Palettes - Jackson's
Two Painters Try Jackson's Artist Pigments for Watercolour and Oil