Marcus, if you look in this same category, I started a thread going thru the build in much greater detail. I think that will be a good place for pointers.
For a simple answer though, I would use a foam roller or brush for the first layers and then a good quality brush made for varnishes for the last layers. I have better success getting it to lay down right with a brush versus foam. But the foam rollers are great when on the early coats and you are mainly worried about getting good uniform coats on.
Let me know if I can help.
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