ue or an acrylic gesso. 
When you buy ready-made canvases, they are already primed. If you make your own 
surface, you can either buy pre-primed canvas, or buy raw canvas and prime it 
yourself.</p>
<p>Stretched canvas is canvas that has been stretched tight like a drum head 
across a wooden frame called a stretcher. Stretched canvas has the advantage of 
being relatively lightweight even in large sizes. Canvas covered boards are 
popular for plein air work as they are generally thinner than the stre