As mentioned, Chain-L is very viscuous, when I apply it I used to follow the guidelines and warm the bottle of oil in warm water for about 10 minutes, but on hot summer days, I apply it straight from the bottle and let it stand in the sun, but if the air temperature is not warm, then I apply it straight from the bottle onto each side of the roller with a small modelling paintbrush and then warm the chain up with a hot air gun and just let the oil soak in.
After a ride or two, the chain may become black with surplus oil which may have spread and attracted a bit of dust, but if you want, just give it a quick wipe, otherwise it does no harm.
http://www.chain-l.com/
And one other additional point is that it actually doubles the life of my chains, usually I wear one out on average every month and half, 1200 - 1500 miles, but with Chain-L, I easilly get 2400 miles before the chain hits 0.75 on the gauge