sand & paint bottom

[hardboiled]

I will fix the damage but besides that which type of tools do i need to have, like sand type and tools

Do you know of any special liquid to remove the bottom paint without needing to sand it, cause the gelcoat under the paint looks good and shiny and also if there is anything to make the gelcoat shine like new again without the need to paint, please let me know

Marine tex cost alot, i think i will use Gelcoat powder mixed with resin