Here is a coaster with stand perfect to paint on. The product is sanded on a smooth finish and are a treat to work on. 
DETAILS
Brand: ArtsyCraftsy
Material: MDF
Width: 5.0 inches
Height: 3.5 inches Thickness ; 4mm
Dimensions: Width: 5 Inches, Height : 3.5 Inches
Weight: 500 Grams
Pack Content: 1 MDF Objects
SKU: A0669