I used this putty in small chunks (every time measuring equal weight of A and B components - use small plastic spoons to take components and a kitchen scale for measuring - then mixing them in a new small container) and it worked very well. I was able to fix a number of holes around my house, and the highlight is a steel patio door that had holes from rust. For this door I first used rust reformer to prevent rust progress, then next day filled holes with this putty, let it harden for a day or two, then smoothed the surface and painted. During application be sure you have plenty of paper towels and several plastic putty knives,. I used WD-40 to moisture and isolate plastic putty from gluing with the putty. WD-40 oiled knife helps with smoothing the putty surface too. Have patience and be persistent in smoothing: it takes good half hour to smooth the surface and get it right. The putty starts hardening after about half hour.
Rating: [5 of 5 Stars!]