I've just started modding the car and need to cut large lumps of bodywork ( more than I thought actually) I have various means of cutting it including an air recip saw, what do you guys recommend

Shooter

1mm cutting disc or a jigsaw using a ceramic tile blade.

Either recip saw or jigsaw will do the job fine.

Mask the cutting area up with tape, it will help protect the gel coat/paint & help to prevent the gel coat from chipping.
Just be sure to use a fine tooth blade.

Used both of those tools till I was bought a cordless Multi-cutter ( Now my go to tool )

Cheaper version of the Worx type multi tool, much more accurate & controllable than the disc cutter & less messy than recip saw or jigsaw, also won't judder & star the fibreglass, nor will it chip gelcoat

wear gloves, and a dust mask if possible

[Edited on 29/5/18 by gremlin1234]

Jigsaw with a carbide style bit, these are like emery paper on a blank blade so basically files rather than cuts.

Something like this https://www.ebay.co.uk/itm/For-BOSCH-3-inch-T150-CARBIDE-50-GRIT-T-SHANK-JIGSAW-BLADE-3pcs-of-Set-Stock/162921239892?hash=item25eedcd554:g:yT4AAOSwUjp ajy-n

[Edited on 29/5/18 by Ugg10]

I found saw blades of any type disappear very fast with fg. I couldn't afford to use a mult-tool at £1.50 a blade. I do use a thin grinder disc, but it does make A LOT of dust. Very effective though.

The best tool I found was a cutting disc in a dremel - just beware the dust! If you can have someone hover around the cutting area with a hoover, that helps massively.

a zingerette is the correct tool to use but well expensive basically a recipricating air tool that uses hachsaw blade there are cheap copies out there that will do just as well also anything you use needs to cut on the downstroke that way it dont chip the gellcoat

[Edited on 29/5/18 by chris]

The dremel diamond toothed wheel at full chat 30k rpm). It doesn’t chip and makes an incredibly clean cut with no effort. You can buy cheap wheel sets from eBay but I’ve found the dremel one to be most balanced.

You get what you pay for, I find.

For gelcoated GRP at the thickness used for car panels of this type, an oscillating multi-tool is definitely the most accurate (albeit not the fastest).

Don't use an old/blunt blade - treat yourself to a new one for the task at hand!

Diamond cutting disc in a Dremel, like a hot knife through butter. Use it on aerospace carbon regularly.