I have a fiberglass shower leak drain leak. It is caused by the fiberglass cracking around the drain. I need to confirm my process for fixing this problem.
1. Remove old drain. It is a metal with a nut on the bottom. Can't unscrew it because the drain is so loose that it turns in the drain opening so I will cut it out.
2. Repair the fiberglass opening either with a kit or get a professional to do it?
3. Put new drain in probably a Wingtite?
4. The drain problem was caused by faulty installation of the shower, no support. To support the drain and shower I plan on using insulation foam since it would be difficult(tight space) to support with wood structure or concrete?

Anyone see any problems with process?