I applied a coat of CombiColor to a stripped galvanised metal door, treated with mordant solution. Anyway, the paint is nothing like normal oil paint for indoor wood work. It's really thick and sticky, and I gave up with a brush and used a mini roller. Can anyone please give me advice on how to apply this stuff with a brush? I've done one coat, two more to go. I'd prefer to hand paint rather than roller it on. I ind it so sticky that brushing it on is a pain. Maybe I apply it too thin? I'm used tio applying oil paint thinly to prevent runs.