I tried EVAPRORUST for the first time a year ago and since become a local distributer in ST. LOUIS, MO. I use this product for many things. Not only does it remove rust but it also cleans up parts like taillight housings without removing the plating. It works great on derusting springs and small parts that are hard to blast and it will not profile the metal like a acid based product. I suggest buying 5 gallon quantities as you can put more larger parts in it and cost less than individual gallons that are sold at the retail outlets. I sell the 5 gallon pals for $100.00. I have not shipped any yet so not sure what that cost would be. Like the previous post said, the cleaner you keep the product the better it will work and last longer. I have got up to 4 months of dipping small parts in a 5 gallon pal. Obviously it varies on how much you dip in it, although I dipped several parts.