What is the best tool to use, to cut fiberglass, and make a fairly
clean, straight cut ? I want to customize a factory glass canopy.

My fiberglass body parts wrecked any kind of saw cutting blade. I had the best luck with a 4 1/2" grinder with a cutting wheel.

I've used an air saw with great luck. Just get the right blades. This Guy (http://www.glassmanscustomforum.com/tools.html) has a saw and blades. His prices are pretty good. I got my last one from Harbor freight, but of course it died. Gonna get a better one soon. Norther Tool (http://www2.northerntool.com/product/22114/) Has one thats more expensive but it looks to be better quality.


Good luck

On the boat we used jig saw with a fine wood blade to cut holes in the dash to mount electronics. Worked very well.

Wear a mask and a long shirt when doing it whatever method you choose. I'd use the angle grinder if it were me.

I have used a jig saw many times. Always worked for me.

Thanks
Dan

I have used a sawzall a lot, allways seemed to work fine.

What is the best tool to use, to cut fiberglass, and make a fairly
clean, straight cut ? I want to customize a factory glass canopy.

I have used a jig saw with good success. For a straight edge I have clamped a 3/16 or 1/4 bar stock to ride the saw against. Make sure to put masking tape down under the bar stock to reduce scratching, same where the jig saw is going to ride. If you are going to do a lot of it, I have stuck the fuzzy side of round valcro under the saw. Make sure you don't get the fiberglass vibrating up and down with the blade.

Jig saw, body saw, sawa-all, die grinder, 4.5" with thin discs... Just about anythign works for me.

Body saw and grinder make the cleanest cuts and require the least clean up.

Only problems I have ver had came form using to fine a blade at to high a speed and loading it up because I was burnign through the material.

Oh and don't forget to wear gloves, glasses and a mask...the cuttings can be irritating.