If you have an old broken cowl, try practising with it first ( you'll find you can fix it this way! ).

After you've tried fiberglassing a few items, you'll come to realize that it is MUCH easier than it seems to work with.

Once I discovered this, I found I could easily fix broken cowls, wheelpants, canopies, etc. and re-inforce wood and plastic structures...

Hint: WAX PAPER IS YOUR FRIEND!

Epoxy does not stick to wax paper even when dry.... because of the wax.

Use the wax paper to help hold a shape, or keep the mix and materials smooth, and/or to keep the mix out of areas it should not go in.

Also remember that you can sand the fiberglass areas once dry too.