Thats a really easy fix. Thats just the gel coat. I had to fix a spot much harder. I ordered the kit from gelcote.ca They are the OEM supplier to BRP. There kits are color matched to match the original color. The repair kit runs about $50 after shipping. You could get away with a cheaper version since it is just white and on the bottom though.
ITs a very easy process. Don't sand that smooth...the repair works better if it has a rough edge to adhere too. Clean it up good with alcohol and make sure it sits and dries out. Mix up your resin and hardener. Use a small hobby type paint brush to fill in the area. DONT use too much, otherwise you will be sanding it for hours. Once it is filled in, cover with a piece of plastic or wax paper. Use a credit card to smooth it out. LEt it cure for 2 hours and have a few beers. Come back, peel off the plastic. Sand it smooth....I put way too much on initially and had to use a drywall type sanding block to knock it down flat. Once it is contoured the way you like, wet sand with 1000 grit paper, then 1500 and finish with 2000. Then use rubbing compound to buff it out. Once done, it looks brand new and is rock hard. You will never know it was ever there. My buddy hit the side of my boat and put a huge gouge in it that was 1/2 wide and over a foot long. I did it this way and you can't tell it was ever there. With that being on the nice flat spot, it should be easy. There are tons of good videos on youtube.