cutting fiberglass ? - Fiberglass RV


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Old 06-18-2013, 12:28 PM   #1
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cutting fiberglass ?

I'm adding an access door to vent an a/c unit in our Hunter 1.
I'm familiar with tools and have done extensive woodworking, but not fiberglass. I was planning to use a drill start, then a fine tooth power jig saw to finish the round opening. Anything better /
Thanx for any.
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Old 06-18-2013, 12:41 PM   #2
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I just put bigger access doors inside under my back bench using a jig saw with a metal blade. Works GREAT. I used some panel trim to finish it off.
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Old 06-18-2013, 12:55 PM   #3
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thanx Kevin.....I feel better about starting the project now.
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Old 06-18-2013, 01:22 PM   #4
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The oscillating multi tools work good too! I've used the 1/2 round blade. No drill start required, just a steady hand.
Oscillating Multifunction Power Tool w/ Variable Speed
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Old 06-18-2013, 01:40 PM   #5
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The very best too I've ever found for cutting fiberglass is Dremel's zip tool attachment. Smooth and easy to control. No chip out.

I couldn't remember the exact name. Here it is.
This with the dremel motor makes almost perfect cut.
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Old 06-18-2013, 03:37 PM   #6
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Down cutting or down clearing (same thing) saber saw blade (in the range of 12 to 20 teeth per inch does a good job from the face side which is of course also the gelcoat side.

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Old 06-18-2013, 03:46 PM   #7
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A fine-tooth metal blade in a jigsaw does OK for small cuts but it will get wrecked fairly quickly and will always be a bit grabby. The hot-knife-through-butter tool is a RIFF jigsaw blade like the well-work example below. Its grit-coated edge cuts forever and is very smooth and steerable. They are a bit of a speciality item but are useful for cutting any very hard material.
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Old 06-18-2013, 04:18 PM   #8
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Nice looking job there Kevin
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Old 06-18-2013, 04:52 PM   #9
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If you drill a hole for a jig saw blade, drill it in the waste area as twist drill bits tend to chip out gelcoat. Raz
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Old 06-18-2013, 04:58 PM   #10
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Got 'er done !!!
I did just use my jig saw W/ a many toothed blade after making a start hole. Came out pretty slick.
I put a portable a/c unit in a closet and vented out through a small (5") round access port. When A/C is needed, I just open the port and the closet door, and crank it up...
When not in use, it is not obnoxious.
Thanx for all the help........
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Old 06-18-2013, 05:00 PM   #11
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I use a multi-tool with a half moon blade. Hold your shop vac near the blade while cutting and it collects most of the fiberglass dust.
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Old 06-18-2013, 08:36 PM   #12
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I use an air powered die grinder with a thin 2" cutting wheel.
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Old 06-18-2013, 08:46 PM   #13
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Originally Posted by mary and bob View Post
I use an air powered die grinder with a thin 2" cutting wheel.
An abrasive cutting wheel (like a rotary version of Andrew's blade above), or a toothed saw blade?
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Old 06-18-2013, 08:48 PM   #14
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The oscillating multi tools work good too! I've used the 1/2 round blade.
Quote:
Originally Posted by Andrew Gibbens View Post
The hot-knife-through-butter tool is a RIFF jigsaw blade like the well-work example below. Its grit-coated edge cuts forever and is very smooth and steerable.
Has anyone tried an abrasive blade in an oscillating tool?
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