That can be painted; to which a coating of paint can be applied.(adjective)
That can be painted (rendered by an artist in paint).(adjective)
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Use "paintable" in a sentence
"It was in the "paintable" green dress that she "pretended" her way to fame and it came about this way."
"Besides those already mentioned, the household consisted of three old maids, who had been with Mrs. Howard from her first year; a pensive art student with "paintable" hair; a deaf old gentleman whose place at table was marked by a bottle of lithia tablets; a chinless bank clerk, who had jokes with the waitress, and a silent man who spoke only to request food."
"If you intend to paint over a bead of silicone be sure that you purchase "paintable" silicone."