How to paint cast iron?

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PekkaNF:
Bit more preparation and paint removal. It has been raining here and mys "shop" is outside with these dirty works.

I tried fast orange and it does removes grease, gunk, dirt really nice when assisted with a nylon brush. It does not seem to remove the paint I have on cast iron though. I have one sticker removal spray that has citric oils etc. and it does good job removing sticky glue.

I found out that unheated liquid drain opener right from can is a lousy pain remover. It does something but not very fast and if you let it soak for hours you exchange paint for rust.

First two pics on this experiment.

Then again when I used four litres of 70C water, laced with 0,3 litres of granulated drain opener (caustic soda?) and applied it to preheated chunk of cast iron and paint was removed in 15 minutes excluding few corners and spots. I applied some steam and that too was cleaned fast.

last two pictures on this episode

I'm very sure that drain opener/caustic soda/alcaline would be a really bad idea on aluminum, thin it would bad also copper metals?

Grit blasting would have worked really nice on these I had the means.

Pekka

PekkaNF:
A little update. I wonder if anybody reads this, because this is pretty basic.

Anyways, I washed the stuff, Dunked them into heated mild phosphoric acid and dried with hot air blower.

Then I taped and masked the heck out of them and hung them.

I got no runs, but some parts were left a little on thin side. I didn't fill or sand them at all.. Just sprayed one thin layer, let dry 30 mins and sprayed final layer. This is recommended on this paint. It has some inhibitors and its possible to paint it on wet on wet as a single medium.

I'm pretty happy with it. I didn't try to make it a show piece, just nice to work on.

Some pics.

1) Masked and hung

2) First thin layer, had to give small tired compressor a break.

3) Second layer.

4) Unmasking took almost as long time as masking it. I was afraid to glue masking tape somewhere painful to reach.

5) Masks out. Have to let them dry overnight.

Haven't done much spraying long time and it shows. Next time I might even use filler. happy I didn't use it today. This was my only whole day off and weather report is threatening plenty of rain for the rest of the week.

Pekka

awemawson:
Looking good Pekka :thumbup:

You'll have a fine little bench drill when that's all back together

PekkaNF:
Thanks Andrew. I'll appreciate it. Many are showing some real skills. I'm just tagging along with this one.

Not sure if I am going rebuild this as a drill or convert this to a taping stand. Depends a little how arbor dimensions work out. It needs a modification.

Pekka

spuddevans:

--- Quote from: PekkaNF on August 17, 2014, 02:29:22 PM ---I wonder if anybody reads this, because this is pretty basic.

--- End quote ---

Oh yes we are reading it all, and while I don't have any projects to apply your techniques to (yet), I am making mental notes for when I do have need of it.

Tim (quietly following along)

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