"Jim Wilkins" wrote in message
news
"Ed Huntress" wrote in message
...
On Wed, 25 Apr 2018 12:25:20 -0400, "Jim Wilkins"
wrote:

"Ed Huntress" wrote in message
...
On Wed, 25 Apr 2018 10:03:37 -0500, shiggins1
wrote:

On 4/25/2018 8:24 AM, Ed Huntress wrote:
On Wed, 25 Apr 2018 13:06:04 +0000 (UTC), David Lesher
wrote:

" writes:


The citrus based solvent has its uses. Does not evaporate
quickly so good on dried grease, old paint etc. But not
great
for cleaning before gluing.

Dan


I use starting fluid (OUTDOORS..) for cleaning that leaves no
residue.

I don't know what the different brands may contain (I use
straight
ether for starting), but avoid anything that contains acetone.

Pure acetone is great for adhesive prepping, but getting your
hands on
pure acetone is not easy. The stuff they sell in cans in
hardware
stores is almost always recycled from industrial users, and it
usually
contains some oil. It has been the source of many bonding
failures
by
home boat builders.

After reading your post Ed, I looked at the can of acetone that I
have.
It does not have an ingredients list, insinuating "pure" acetone.
There's no statement of purity either.
I've had some paint failures that I blamed on poor prep
techniques.
Using acetone for prep often allows me to wipe the old coat of
paint
away without scratching the part. I've gone back to using alcohol
to
wipe the part down before painting. Oil in acetone could explain
it.
I'm going to contact the manufacturer on the can for comment
since I
bought it at the Borg. Stay tuned...

Steve

Here's an interesting claim from TAP plastics -- "Our Acetone is
virgin acetone and is not made from recycled acetone. It does not
contain any residual waxes or oils."

https://www.tapplastics.com/product/...tap_acetone/11

Acetone sold in hardware stores is almost always "industrial
grade,"
which is the stuff that contains small amounts of contaminants.

Apparently there are ways to recycle it to remove all of the
non-volatiles, but it's pretty well known in the boatbuilding
business
that hardware-store acetone is corrupted with non-volatiles,
especially lubricating oils, and that it can't be used to prep
cured
polyester resins for laminating. When surfacing polyester cures
(and
all of the resin sold in hardware stores is surfacing resin) a
waxy
layer rises to the surface to seal it from the air, and that gets
into
acetone, too, when you wipe the layer down to laminate on top of
it.

(There's no need for it with epoxy prep; just wash with warm
water
and
detergent, like real TSP.)

It's too bad, because acetone is a great cleaning solvent, and
safer
than a lot of others. It's just that the common grade can present
problems when you need a really clean surface.

--
Ed Huntress

I had good results with this on the front surface mirror in a
copier.
http://www.crcindustries.com/product...-oz-05110.html

That's quite a hydrocarbon soup:

http://docs.crcindustries.com/msds/5110.pdf

Hey, if it works, it works.

--
Ed Huntress

Petroleum is a complex mixture. BTW 2,2,4-trimethylpentane is
"octane".


https://chem.libretexts.org/Textbook..._A_Deeper_Look