This week I tried using some Shaw's Royal Coatalin.
It's an old tin that I had in from using on my bigger dogs. It's a really old established product & a bit odd to use if you're not used to it as it's a solid block in a tin, looks a bit like a tin of clear shoe polish
The best way is just to dab the end of the bristles of your brush on the block then brush it into the coat.
I must say it's worked a treat! Their coats are lovely, glossy & silky. I thought it might have made them a bit greasy but it hasn't at all.
It's really economical as well as a tin lasts ages.