I am curious when a surface should be reprimed (if ever) vs just repainted. Are there any general guidelines? If it is badly stained, should I reprime or use some stain blocker?
Please consider this picture of a 30 year old casement window (wood). I stripped some paint from the trim around it and the stripper got on the window + just regular grime settlement over the years. I would like to repaint white semigloss but am not sure if I need to reprime first to block the ugly stains.