Used photopolymer resin can always be poured back into its bottle for later use, but there is always a risk of contaminating the rest of the bottle due to cured resin and exposure to micro particles and dust.
These screw cap bottles are a perfect solution to store used resin for later use. At 100% opacity, your used resins will be protected from any light source, no matter how strong. Comes in 250ml, 500ml and 1000ml options. Ships within a week.