This piece is outside and its cool outside but there is also rain in the forecast for Sat. So this is getting done tonight or in the morning. I will be leaving town for about 2 weeks on Sun. So what ever has to be done it will be DONE Fri night. I have not had a chance to do the filler work so it will be done later, right now I have only time to cover the metal. Can I add to the epoxy in a couple of weeks , filler and a top coat? Or does this have to be done within a certain time period?