I don't know the best way to repair the hood, but if using fiberglass, we used to use cheap paint brushes to dab resin on the part. Then place a layer of fiberglass cloth over that and use the paint brush to tap the cloth down into the resin and when the cloth is laying smooth, then wet the paint brush with resin and dab it onto the cloth. You want just enough resin on the cloth so that you don't see any dry patches on the cloth. Extra resin on the cloth doesn't make the part any stronger.
Fiberglass cloth doesn't conform well to sharp corners. They also make fiberglass strand mat which is easier to work into and around corners and edges.
Depending upon how much hardener you add to the resin and how quickly you work, you may be able to add a few layers of fiberglass before it begins to set.
Acetone works excellent to remove uncured resin from hands and tools.
Maybe talk to an Auto Body Supply Store to see what they would recommend. Also, on some plastic parts, there are codes which indicate what type of plastic it is. Like my dirt bike air scoop has PP on it and that stands for polyproylene. I believe it has a recycle number of 5. Looking thru my recycles I noticed a lot of things are 5 so I'm going to use a piece of a number 5 recycle item which is approx the same color to plastic weld my scoop. Can't say how well it will work, just an idea.