Ferm is right on the money about a sawzall being great for cutting fiberglass. For large projects I wouldn't use anything else. But there are a few other tools that might be a little easier to use for delicate work. Fein makes an Oscillating Multifunction Power Tool that is simply fantastic, but very expensive..($300+). however you can buy the same type of tool from Harbor Freight http://www.harborfreight.com/oscilla...ool-68303.html for $29 - $49 dollars, depending if you just buy the tool or if you buy the entire kit. Very nice, about the size of a mini disc grinder, and easy to control. (These are the same types of tools that doctors use to cut fiberglass casts off broken limbs) Also, if you have a jig saw or a scroll saw both of them will work really well also. The only problem with them is the need to first drill a starter hole for the blade to go into...but after that they're fine. If you should decide to use a jigsaw or scrollsaw then I'd stay with the 10-14tpi blade that Ferm mentioned.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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