My recent purchase of D. Smith Masking fluid has been a great help to me , I was surprised that it dried so clear, and was concerned that I had not applied it properly in masking out an important element in my watercolour, a rather epic piece which would be ruined by washing shadows over an unstable mask,. however this product proved its worth with protecting my critical element, thereby saving my many hours of work, I would highly recommend this product to any artist needing to mask fine details , as the applicator nozzles are a great help.