Bubbles are one the banes of the varnishers existence. If they break while the varnish is still wet enough, they cause no problems, but if they don’t break until after the varnish has begun to set up, they create depressions that look something like the craters on the moon. Avoid bubbles by remembering you are working with a paintbrush, not scrub brush.
Dont apply from the original can, instead pour small quantities into a separate can or plastic cup and refill as needed. Wipe your excess varnish at the start of each stroke gently on the inside of the container. When you wipe your brush on the rim it aerates the bristles; thus you not only foment drips down the outside of the can, you foster bubbles.
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