DON'T THIN IT!!!!!!!!!!!!!!!!!!!!!
I'd use the pumps and not hassle with it. West's tends to flow fairly well at room temperature, better still when heated up. Since 207 is formulated for glassing and coating, it should work fine for coating your boat. On my Pak hull, I coated it with 209 brushed on with an acid brush. It actually looks good, not up to my standards for a final finish due to soaking in overlapping cured with fresh but, with some sanding, it's ready to paint