If you don't dare to make mistakes you'll never do anything new.
Having said which, putting black colouring in the second epoxy layer on my new boom wasn't a success. What I had hoped would give it a modern carbon-like look leaves it looking like a piece of impregnated pine you would buy at the local garden centre for a fence post.
No time to do anything about it as we are off to the Schildweek in an hour's time, but when we get home I'll sand it back to bare wood and start again.
Unless of course it turns out to be a very fast fence post.