I'm using epoxy that is over a year old and it pours slowly. If I heat the bottles with my covering heat gun for a few seconds, it thins out and can be warmed up enough so it does run like water. It still hardens well.

When the wings fall off my planes they don't just fall to the ground. They follow the plane because they have stringy things on them that are like when you step on bubble gum....Just kidding.

It works ok for me. I do it with anything from 5 minute to 30 minute epoxy.
Try it on a scrap pieces of wood and make your decision. Just give it time to cure.
Ron