A paint is genetically a black bird that is heterozygous for the dominant white gene. Typically silkies are recessive white which is another white gene entirely so if you were to start from scratch to make paints you would have to introduce the dominant white gene from another breed. Any white gene is not JUST white. The white is a "mask" for whatever color is underneath. The bird will get 1 copy of each gene from each parent, so if the offspring are black with "ii" as their dominant white genotype, they do not have dominant white and will be black. If they do get a dominant white gene from each parent and have "II" they will be all white. If they only get one dominant white gene they have "Ii" and this is what is said to cause paint. Because they only have 1 dominant white gene the white "mask" isn't strong and gets holes in it, showing the black coloring underneath.
Another thing to consider is that dominant white only masks black pigments, not red. For example red Pyle is black breasted red with dominant white, it leaves the red but makes all the black areas white.
I know it's very confusing, hope this helps!