Okay, the thread started six years ago, but there have been posts this year, so we're good, right?
I hope Michael Borrelli and anyone else who wanted to know about bidding jobs got the information they needed. I may be able to dredge up something on area (sq. ft.) vs. hourly.
Anyway, to answer garyw's question, I tried
Motsenbocker's #4, and it kinda worked, but then again, I was
kinda following the instructions, too. I didn't have a pressure washer or even a hose available in the place I tried it, so that probably made a big difference.
It is partly acetone, and like many of the other graffiti-removal chemicals, "also contains trade secret ingredients." (Quoting from the MSDS there.)
From what I've seen, it looks like most of the better-known chems contain potassium hydroxide (KOH) in various concentrations and weights or volumes or whatever. (I am not a chemist, nor do I portray one on TV. But I did go to a HazMat Operations class once.
)
BKE's Elite contains 5-10% KOH, and also has 30-60% ethanol and 10-30% of a proprietary "Solvent Naphtha (Petroleum)." There are a couple of other proprietary ingredients in there, too.
BK Enterprises now has all new (02/09) Product Data Sheets and Material Safety Data Sheets for their anti-graffiti products on their site.
Since the WADU was mentioned in here, too, who else is using one? I just got mine yesterday. I'm still planning on doing dry soda-blasting some day, but the WADU and a good hot/cold pwasher will be a lower cost overall than any of the dry soda pots I've looked at (Eastwood, etc.) plus a 30 HP compressor.
I've also noticed there don't seem to be many compressors that are powerful enough
and portable (i.e.,
not 240/480 volt, three phase). Trailer-mounted units aren't "portable" enough for some of my uses.
Yeah, mea culpa too.