Runs on Waterlox 89/88 on vertical surfaces, Help!

I am building some furniture and using Waterlox XL89 clear for a couple of coats and a finish coat of XL88 satin at the customers request. I have never used this product before and am pretty sure I never will again. I can't get it to have a full coat and not run on vertical surfaces. I have tried everything in my arsenal. I have tried all four guns with different tips, straight out of the can, thinned 5% and 10%, and I cant get it. I have never had this problem, but then it is not a type of finish I normally use. It does have a couple of coats of Zissner sanding sealer under. By the time I get an even coat, it runs. Might be great for a floor, but I hate this stuff!



I am losing money on this job as I just screwed up the fourth "Final coat". Help me get this thing out of my shop!



Frusterated.......Larry

(999)

Runs on Waterlox 89/88 on vertical surfaces, Help!