Aussie - Glassing is incredibly easy. Growing up all I could afford is planes the Airtronics Q-Tee but back then the coolest planes going other than scale were what are now known as Classic Pattern. You know... Dirty Birdies, UFOs, etc.

Anyway, those guys all glassed their planes and they looked awesome. Of course they could all fly circles around me so I thought they were masters of everything and that fiberglassing was a black art.

First time I ever tried it the glass came out great. Once you start with it you'll see how very simple it is.

The best thing to use for reinforcing is a low viscosity epoxy - usually called "finishing resin" or "laminating resin" (may also use the word epoxy instead of resin.) Just be sure you don't get polyester resin. It's more brittle, weaker and the fumes are really horrible. Not to mention it can give you chemical burns if you get it on your skin.

You'll know if it's polyester resin because it will come with a little bottle or catalyst which I think is peroxide based. You add a couple drops and mix it in. The other problem with it is that measuring the drops in small quantities of resin is hit and miss. If you add too much it will sudeenly set off and if you're half-way through the job you're screwed.

Now only for small reinforcements like your firewall, you can use regular epoxy instead. It's harder to work through the cloth but will work.

Best thing to do is brush a little in the joint before you add the glass. Put the glass in place and use your brush to push it down by stippling.

DO NOT thin the epoxy for any reason.

You can use a hair dryer to warm the epoxy a little to make it thinner and easier to work with. You can also put the cup your mixed epoxy is in into a larger container with warm water.

Or you can brush on the epoxy carefully not to move the cloth out of place and then warm the joint with a hair dryer to make the epoxy thinner so you can brush it through the cloth. Don't use too much. Epoxy on top of the cloth doesn't add strength, looks sloppy and is dead weight.

Just let it cure and you're good to go.

Oh yeah... if you don't have fiberglass then don't use the stuff they sell in auto parts stores. It's way too heavy and you'll never get it to stay in a corner. 2 oz cloth is the heaviest you should use for your firewall but 0.75 or 1 ounce cloth should be fine.

Now that I've typed all that I would bother with the glass at all. You'll get more rigidity from square or triangle stock in the corner. it's easier, cheaper and faster.