I have only been painting a few years and have only varnished a few paintings. But I recently did a portrait painting of friends that turned out extremely well... at least for me. In the end, after it was dry, I applied a gloss varnish that (seemingly) went on ok, After it had dried, I applied a second coat and although I thought I brushed through it properly, it has pooled in spots. Pooled in the sense that the varnish has the look of water sheeting down a pane of glass. I carefully applied a third coat and I am still getting a few 'sheeting' lines. Now I'm not sure what to do. I've never tried removing varnish and the painting is one of my best so I'm at a loss. Any thoughts? Thank you.