wing15601 wrote:
...I have 3 coats of epoxy and 1 coat of resin/hardener, do I still need 3 coats of varnish?

It sounds from that statement that you have applied resin and hardener separately. If so it must be a gooey mess. Smith's penetrating epoxy sealer is designed to be sufficient without any other epoxy coating. If you've applied more epoxy, properly mixed with the harder, that's fine, just a waste of time and money. Not all epoxy leaves an amine blush, check with the West System web site to see if that which you have used doses. If it does, awash it with plenty of water and dry as the amine is water soluble and will rinse away. If the site ss says it does not leave a blush then proceed with sanding before varnishing. if it does leave a blush, don't sand first as that will just grind the amine waxes down into the surface. The no sand varnish doesn't mean you don't have to sand before applying it. It means you don't have to sand between coats if you follow the directions on the can.