Tool Talk

General Category => General Discussion => Topic started by: lptools on March 23, 2020, 05:48:30 PM

Title: Painted Cast Iron & Evaporust
Post by: lptools on March 23, 2020, 05:48:30 PM

Hello, I am trying to clear off the workbench, and this was next in line. I am considering soaking it in Evaporust, but it looks like the underside, and the fence parts, are painted. Any suggestions/concerns ? This is a Porter Cable 5056 Shaper Top. Thanks, Lou

Title: Re: Painted Cast Iron & Evaporust
Post by: oldgoaly on March 23, 2020, 06:05:03 PM

I'm not a evaporust user, but do use phosphoric acid. On painted items oxalic acid is what has been recommended & used by can collectors. It works but slower than phosphoric.

Title: Re: Painted Cast Iron & Evaporust
Post by: lptools on March 23, 2020, 06:16:24 PM

hello, oldgoaly. Where do I find those products? Thanks, LLou

Title: Re: Painted Cast Iron & Evaporust
Post by: amecks on March 23, 2020, 07:05:54 PM

Ospho is a brand name product containing phosphoric acid.  Phosphoric and oxalic acids should be available at hardware stores or Lowes or Home Depot. 
Al

Title: Re: Painted Cast Iron & Evaporust
Post by: oldgoaly on March 23, 2020, 07:30:07 PM

Oxalic acid is used as a wood bleach, Been a long time since I bought  have it mixed with water in a cat liter bycket, name of the brand was something like "bondex" black/yellow/white round tub.

Title: Re: Painted Cast Iron & Evaporust
Post by: lptools on March 24, 2020, 04:17:51 AM

Hello, Guys. Thanks for the info, Lou

Title: Re: Painted Cast Iron & Evaporust
Post by: oldgoaly on March 24, 2020, 07:06:14 AM

the cheapest and most concentrated phosphoric solution I have found is Prep and and etch, about 20-25% phosphoric acid. 

Title: Re: Painted Cast Iron & Evaporust
Post by: lptools on March 29, 2020, 06:51:46 PM

Hello, Here are the "after" photos, I went with the Evaporust for the castings, and all of the small parts went in the tumbler. Regards, Lou

Title: Re: Painted Cast Iron & Evaporust
Post by: gibsontool on March 29, 2020, 07:00:36 PM

Looks like the evaporust worked quite well.I bought my first jug of it maybe 3 weeks ago and I'm impressed.

Title: Re: Painted Cast Iron & Evaporust
Post by: lptools on March 29, 2020, 07:13:12 PM

Hello, The stuff works great, you just have to get a feel for the soak time. Try to clean whatever you are soaking first, grease and oil will cloud up the liquid. I try to scrape off the scale, ( single edge razor blade scraper, or a carbide scraper) and then a stiff nylon brush to clean up loose stuff, before soaking. Keep it covered when soaking!! Regards, Lou

Title: Re: Painted Cast Iron & Evaporust
Post by: p_toad on March 29, 2020, 07:34:17 PM

Quote from: lptools on March 29, 2020, 07:13:12 PM

Keep it covered when soaking!! Regards, Lou

Good call on the keep it covered.
I picked up one of those under-bed/wrapping paper storage things (large - shallow - wide) for doing handsaw blades.   If the weather stays half-way decent and we don't get more torrential downpours i may do some of the blades i have sitting around.