I've been thinking about doing the same thing to my rockers. Just so people know I was quoted $300 for the job.
You're kidding! Was it from LineX? Those guys quoted me something like $600-$700, and I said forget it! They said it was because of the prep work, "It's not as easy and just spraying a bed."
And by the way, if anyone is curious how my Herculiner job is holding up, not so well. Brush scrapes are beginning to rub out some of the thinner spots and you can see through it in some places. The good thing is that for only $29 I can add another layer. I'm not sure if I didn't give it enough layers in the first place or if this is just another example of "you get what you pay for". In any case, it's still looks good for the most part, and is still functional, and I only spent around $30.