Wasn't sure if my old half used tins of Mastic 121 would still be usable; haven't touched the paint in almost 5 years. I asked Rustbuster (the manufacturer) and they could only guarantee it would remain good for one year. Although exterior of the tins were scabby, the paint components were still looking alright on the inside upon vigorous stirring.
Top tip: this miraculous preservation could be down to the fact that I covered the remaining paint with cling film when it was last used. Literally laid it directly on the paint surface inside the tin to create a barrier between the paint and air.
I was a bit frustrated at first as the paint mix and gun settings were off and as a result too much paint was being let through and affecting the finish. Also, although it had been thinned to the recommended 20% the paint was quite 'splattery' on application. It was a passable finish, but not as good as I hoped. I let it cure for a couple of days and then applied a second coat, this time I thinned the paint down to somewhere in the region of 25 - 30% and that really helped with the flow. Also, I took my time dialling in the gun settings that gave me pretty decent control and reduced the amount of paint flowing out of the gun.
For the most part the second and third coats helped to reduce the sins of the haphazard base coat and left a result that I was satisfied with. It goes to show that a few small adjustments can yield far better results.
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