how or what would I use to trim a pre molded fiberglass deck for my j16

Cutting a fiberglass panel can be accomplished with many tools.
Hacksaw, jigsaw with a metal cutting blade, circular saw with abrasive discs/blades
I happen to like jigsaws.
They are lightweight, maneuverable cheap and accurate.
Don't force the cut, take it slow, work accurately.
Saves sanding time when the cutting is done.

 

If you need to make straight cuts then the circular saw works best. Short, curves or rounded the jigsaw is easier. Either way, as Brett said, use the blades that have abrasives as a cutting surface rather than teeth - they will do a lot of the sanding for you.

 

Any cutting or sanding you do on fiberglass,
do outside, with a dust mask on and long sleeves and long pants.
Try to set up so the wind blows the dust away from you.
I use an old box fan for additional air movement.
If the fiberglass dust gets on your skin, when you hit the sack that night
it'll feel like you've been dusted with itching powder.

 

and remember, yer naybores can still hear you cuss through a resperator. : :-[

 

And definitely wear a respirator.

 

Home Depot or Lowes both sell carbide grit jigsaw blades. Works really well on fiberglass.

 

Give me a buzz and I'll see if I can point you in the right direction.

 

He'll get that when he starts playing with resin...

 

[quote
If the fiberglass dust gets on your skin, when you hit the sack that night
it'll feel like you've been dusted with itching powder.[/quote]


  yeah let me tell you about it, i would take breaks during the day while working on my sled to check the forums and the fiberglass dust got on my chair and in the cushion  after showering at night i'd slip my shorts on and plop back down in the chair to check the forums again, you dont even want to know what happened when i jumped in the sack    why is it i always have to learn the hard way?!?!?  :-? :-/ :-[ ;D

 

Because for some reason, pain is still the best teacher.
Pain is life's way of saying "Hey, DumAzz! Don't do that!"

[smiley=happy.gif]

 

I'm a slow learned except when it hurts or costs me money. Then I learn real fast...

-T

 

At the shop I used to work at we use to score trim lines into our molds. Made trimming that much quicker/accurate.

The other method we used was a template that would lay over the new part. Then we would run a hand held router around it using a flush trim bit. By far the best method for a small shop.

In your case it looks like they are just trying to save money.