How to fix a small hole in a fiberglass bath tub?

I have a small hole in the corner of my bath tub (drain side) that is approximately 3-4mm x 8-9mm. I know this isn’t a large hole but I do not want water leaking out and rotting my sub floor. What is the best way to repair this.
I am not able to get to the under side or back side of the tub.

It would be like fixing a boat on the reverse , you want to keep the water in not out , so I think that using putty would fix it , but in the long run you might need to replace the tub and the floor , look out for mold build up

http://www.ippnet.com/EN/main/products/FIBREGLASS/9388.html

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