One caveat about oiling frames. If the boat will be used primarily in salt water, linseed oil is fine. If it's going to be used primarily in fresh water, you need to use tung oil instead, as linseed will promote mold and mildew growth, unless you buy one of the highly purified linseed oils that are hard to find and expensive. Make sure that your tung oil product specifies that it's 100% tung oil, as most products that call themselves "tung oil" are actually wiping varnishes.

If you're getting runs on the inside of the boat, you're applying too much finish in the first coat and/or using too much pressure when applying it. Polyester soaks up varnish readily, so you don't need to be aggressive with it. If runs are occurring at stitch holes, there's a simple solution. I use a squeeze bottle to apply a drop of varnish at each stitch hole after applying the first coat. That seals the hole so that subsequent coats won't cause drips.

When using tinted coatings, make sure that you have tint in the first coat. If you don't and the boat gets scratched, it may go down to the clear initial coat and show badly. I know this from experience. :-(