I just Herculined my CJ last month. I'm VERY happy with the results, especially since I sprayed it on rather than rolling it on. Just fill any holes with a little balled-up masking/painters tape and you'll be fine. If you do this, remember that prep work is the key. The more complete your prep job, the happier you'll be with the results.
Oh, and do spray it in if you choose to Herculine.