The application is explained well on the pins and the package. I find the use of quite simple. Due to the dry season, however, you should allow some time for the use, which is the finished work of art, of course, does not have to sit and watch the dry, but in the meantime something else can make.
For testing, I've bought a simple white mug in Euro Shop. This could also be painted well, you should be careful, however, not to blur the freshly applied paint by hand.
For me, no paint was dry, but the pins held different lengths. The color result I am satisfied. All colors shine beautifully and are clearly visible.
Overall, I am satisfied with the pins. They serve their purpose, are easy to use and the result is also in view of the low price of the set fine.