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Open Roads Forum  >  General RVing Issues

 > Cutitng Fiberglass

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Fire19

Michigan

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Posted: 05/02/19 01:56pm Link  |  Quote  |  Print  |  Notify Moderator

I am ready to install a larger Hot Water heater in my 5th Wheel I have to open the hole in the Fiberglass by 4" on top and 4" on one side. What is the best way to cut the fiberglass without it chipping and cracking. This is on a 2002 Gulfstream Seahawk. Thanks


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navegator

San Diego CA.

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Posted: 05/02/19 02:09pm Link  |  Quote  |  Print  |  Notify Moderator

Use carbide blades on a scrollsaw unit, cut a bit smaller and then use a file to finish the cut, go slow and let the blade do the work if you push too hard you will chip the edges, going slow makes a cut that needs very little dressing.

navegator

RedRollingRoadblock

Oregon

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Posted: 05/02/19 02:17pm Link  |  Quote  |  Print  |  Notify Moderator

Run some painters tape then cut through it. I will help reduce the possibility of chipping.

Got clearance? No frame or any thing in way?

beemerphile1

Ohio

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Posted: 05/02/19 02:42pm Link  |  Quote  |  Print  |  Notify Moderator

Oscillating saw, pick one up at Harbor Freight cheap.


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Z-Peller

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Posted: 05/02/19 02:55pm Link  |  Quote  |  Print  |  Notify Moderator

Cut so blade teeth are going down thru gel coat side of material..scroll saw teeth will pull up thu material and chip gel coat. Put masking tape on gel coat side and cut with fine tooth saw pushing. Don't drag on the backstroke. Drill starter hole inboard of cut line if needed..


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LarryJM

NoVa

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Posted: 05/02/19 04:09pm Link  |  Quote  |  Print  |  Notify Moderator

Dremel either an abrasive fiber cut off wheel or a dremel mighty max with the 1/2 round cutoff blade. I would test first on a line inside where your final cut will be for practice and get some experience.

Larry


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Terryallan

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Posted: 05/02/19 07:09pm Link  |  Quote  |  Print  |  Notify Moderator

LarryJM wrote:

Dremel either an abrasive fiber cut off wheel or a dremel mighty max with the 1/2 round cutoff blade. I would test first on a line inside where your final cut will be for practice and get some experience.

Larry


Agree. Something without teeth would be best.


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2manytoyz

Central FL

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Posted: 05/03/19 07:10am Link  |  Quote  |  Print  |  Notify Moderator

As already mentioned, an oscillating cutter. I used a cheap one from Harbor Freight to cut a fiberglass cover I made for an airpack (for work).

[image]

[image]

Link to the oscillating cutter: https://www.harborfreight.com/variable-speed-oscillating-multi-tool-63113.html

The tool itself works great, but I would suggest upgrading the blades if you plan on using it for more than a job or two. Here are the blades I'm now using: https://amzn.to/2DNsbge


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ppine

Northern Nevada

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Posted: 05/03/19 08:04am Link  |  Quote  |  Print  |  Notify Moderator

I used to build fiberglass sail boats in WA state. One of the best tools is an air powered pizza cutter. A little round saw with 3 inch blade.

Jack Spratt

Maine

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Posted: 05/03/19 12:56pm Link  |  Quote  |  Print  |  Notify Moderator

Abrasive grit blade in a reciprocating saw


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