I didn't and I wouldn't. I don't think Dcell is necessary for the area you are working on. Just make sure you have used enough layers of glass to make it strong.
-Worst scenario, if you bashed the nose with a direct hit again it'd be even easier to fix 2nd time around!
You say you like working with epoxy resin more than polyester.... wonder if you'll still think that after sanding??
Something to think about is how you will spray the new nose for the best finish. The bottom is easy. -just spray and
fade the white paint into the boards white over a distance of about 30cm and then lightly sand with fine grade wet and dry. (you won't see a thing)
The deck is different though.
- It amazes me how many ding repairers spray over the sugar coating which ends up looking very ordinary. (you'll be disappointed if you do this)
I reckon there are 2 ways of doing it
a) sand the sugar coating off the front 30cm of the deck. You don't need it anyway (unless you plan on hanging 10 with the SUP boys) and it gives you room to fade the paint similar to on the bottom, so after a light sand, there is no visible line.
or
b) sand the sugar coating off the nose, following the natural line of the rails around. Then mask off so you can't spray the sugar coating and spray away. this will give you a bit of a line (which you can sand down a bit) but it'll still look good cos it follows the line of the rails anyway.
in the pics below, the white and greeny/yellow boards are done using method a)
-they now have no grip on the front 30cm, but the colour blend is undetectable.
for the peppermint flow I used method b) -you can see a slight line where I masked around the sugar coating and although the colour match is good it's not 100 %. (but it retains its grip right up to the top)
I like a) better!
Start sanding and don't paint till it's smooth as silk!