I have a couple of classic cars, and I bought Galvafroid to keep the rust at bay on one of them, and the classic car restorer reported that there was only just enough for the repairs he did. Now that I am looking to use Galvafroid again for further rust treatment I contacted Tools-Paint to find out how long any left-overs would remain usable if I bought a larger quantity. Their reply with advice was very quick and very helpful. I have noted this and will happily buy from them again when necessary.