The bottle has an air-tight seal which can be replaced after use. The MRP on the bottle is 470, so not much of a discount, overall the flux is good. Small bottles of 10ml Liquid flux cost a lot. I plan to use this 200ml bottle to refill my small bottle and am sure it will last more than 2 years for my DIY projects. This is the only site I found where 200mL flux is at a reasonable price. Also, the customer care service is very responsive.