Overview Reviews Product Description Mix 1-5% of Retarder MG in to ink to help extend the open time and keep the product from clogging in the screen. Product Videos Custom Field Product Reviews Write a Review Write a Review × Matsui Matsui Retarder MG Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *