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Is Gunk Thrust (Engine Starter Fluid) Safe 4 Spray N Pray

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Is Gunk Thrust (Engine Starter Fluid) Safe 4 Spray N Pray

Unread postAuthor: OldSpice60 » Fri Dec 28, 2007 8:34 pm

So I have a basic spray N pray I just constructed out of PVC pipe, and I am wondering if using Gunk's Thrust is safe for the piping. This aerosol is extremely flammable, and I am sure it would make an excellent propellant assuming it is safe enough to use. Thanks.
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Unread postAuthor: bigbob12345 » Fri Dec 28, 2007 8:40 pm

If the pvc is pressure rated it should be okay if it is dwv I wouldnt know
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Unread postAuthor: carter » Fri Dec 28, 2007 8:42 pm

sounds ok. for a simple combustion don't think you'll be in trouble, just use rated pipe
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Unread postAuthor: ralphd » Fri Dec 28, 2007 9:02 pm

It's going to stink. I went through a bunch of "chemical" sprays and they left me gaging. Try Suave deodorant..blue can, baby powder scent, I think. The burnt smell is alot better. Another good one, believe it or not, is cooch spray. I mean something like FDS.
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Unread postAuthor: OldSpice60 » Fri Dec 28, 2007 9:47 pm

ralphd wrote:It's going to stink. I went through a bunch of "chemical" sprays and they left me gaging. Try Suave deodorant..blue can, baby powder scent, I think. The burnt smell is alot better. Another good one, believe it or not, is cooch spray. I mean something like FDS.


Thanks for the tips, but I'm just interested in performance not smell. But yes I have to admit the static guard I am using now does small quite bad.
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Unread postAuthor: SpudBlaster15 » Fri Dec 28, 2007 10:30 pm

Does the label provide any indication of the presence of an upper cylinder lubricant inside the can? If so, I would be weary about using it, as said lubricants are capable of damaging PVC and ABS materials.
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Unread postAuthor: jimmy101 » Sat Dec 29, 2007 11:06 am

Lubricants shouldn't bother PVC, assuming the lubricant is basically a nonflammable grease.

PVC will handle hydrocarbons including greases, gasoline, diesel etc.

PVC doesn't like ketones like acetone, methyl ethyl ketone (MEK), and some very polar ethers like tetrahydrofuran (THF). Other ethers, like dimethyl ether and diethyl ether (common in engine starter sprays) are OK.

You should read the label carefully and try to figure out what is in the can. The ultimate test is to just spray some on a piece of scrap PVC, let it sit for a minute or two then try to scratch the PVC. Any softening of the PVC means the fuel shouldn't be used.

Lubricants, and other basically non-volatile and/or non-flammable components in the fuel may gum up your ignition system. Flint sparkers are particularly sensitive to anything that acts like a lubricant. Spark gaps used with electric starters (piezo, battery, camera flash) will tolerate more gunk but after many firings you may need to clean them off.
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