$450, particularly if that includes the paint, hauling and launching, does not sound unreasonable.
If you can get it out of the water onto a trailer or such, you could do it yourself. However, it is messy, a tad miserable and the weather may not allow it to be done on the day you have available. That's why people make a living doing it.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.