Trust your gut on this one. I mean, a cured slab still moves with the seasons, and that's a long run. I'd show him the spec and ask him to follow it.

Hold up, doesn't that just add another email to ignore? Feels like extra work for everyone.

Remember when everyone wanted that beach wave perm? I had a client with super fine, straight hair who insisted on it, and it just went limp and weird after two days. Sometimes the trend just fights what you've got to work with.