paint motor with a brush?

Does anyone here use GLYPTAL PAINT for the internal areas like the lifter valley anymore? I have used the external brush on engine paint and it works fine and a lot less overspray and less masking lol.

I've bought glyptol paint for every engine I assembled. I apply it to the lifter galleys and all the internal areas that get bathed in oil (including the heads). I was always told that it helped to seal the casting and allow oil to flow faster back to the pan. I think that it keeps any contaminants from adhering to the cast metal and allows them to be picked up by the oil filter.