I have 0.5 L of this for a single job, brush applied. Consistency is like treacle and could do with thinning. I've tried brushing on and it drags. Unable to clean the new brush. Tried xylene, etc. Any idea what thinners will work, other than the official steyer branded one? eBay seller is useless and steyer don't answer the phone. I'm beginning to wonder if Steyer is a one man band with an eBay shop.