Small Crack

So, as the title mentions, I have a small crack in my rear clam behind the wheel, close to the bottom. I know that the correct fix for this is to take it to the body shop and have the entire clam repainted, yadda, yadda. I hate to do that for a crack of this size though. It's only a couple inches long, tops, and not really visible unless you're looking for it.

Does anyone know if I can just pull the crack open, fill in the void with resin, clamp it together and let it dry? Do I need to drill the end of the crack to keep it from spreading? I'd feel really stupid spending 5 grand on this.

Thanks!