Rain gutters and body seam sealers

Thanks for the compliment. I'm no professional by any means but am happy with the results. As for the sanding that's not really an issue as I planned to give the entire car another scuff with the 400 grit before spraying the sealer coat. But yes, it does add another step to the process.
Not only does it add another step but now we have dust contamination so lots of cleaning with solvents and the chance of having a non sanded area. The beauty of epoxy is its non sanding properties. I'm sure you will be fine, just clean clean clean before more topcoats. Seam sealing is generally the last thing I do right before topcoating.