If you mean replastering a pool yourself, it's not a DIY job....that is, not unless you want it to look like it was a DIY job [emoji6] Plaster is typically mixed and applied using a diesel driven plaster pump and then requires a crew of about 5 guys to get the job done. There's a lot of "Art" to the process and an expereinced crew that knows what they're doing will make an old pool look new again. An inexperienced crew that doesn't get the chemistry right or know how to properly trowel will leave a pool surface looking as bad or worse than before.