hardner in rustoleum for frame jig? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-17-2011, 11:31 AM
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hardner in rustoleum for frame jig?

I built my new frame rail jig with 1/2" ply and 2x3's. I'm going to paint it with safety yellow rustoleum so it doesn't burn from welding and it should make it a lot easier to see welding.. as far as the possibility of burning. I know it is still there but I do have a fire extinguisher..

I know from experience that it takes a looong time to dry. could I use some Restoration shop medium hardner for there Acrylic enamel line to make it dry a little faster?

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Old 03-17-2011, 06:39 PM
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Well I tried a little bit. thought it might coagulate when mixed but it didn't.. mixed the paint with about 1 part hardener- 4 parts rusto and 2 parts thinner. mixed it up in the paint tray and rolled it on, and used 1/2 qt for 1st coat
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Old 03-18-2011, 11:52 AM
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Hey Matt, how did it work out? Did it harden ok?.....John
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Old 03-18-2011, 03:32 PM
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sure seems to have done somthing. at least it is drying faster than it normally does. went out this morning to find the paint tacky but ambient temp last night was 35-40ish*. rolled on a second coat this morning with ambient temp @ 60*. checked it few hrs later and it was mostly dry. stuck a heat lamp on it and fired up a propane tank top heater and it should be dry in a couple more hrs... last mower I painted with a brush and straight rustoleum took a week to fully cure @ 75-80* ambient temp..

The real test will come when it comes to holding up to welding heat/ sparks... I used rustoleum with the thought tractors are painted with it and welded on all the time
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Old 03-19-2011, 05:41 PM
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I've used automotive hardener with rustolium with good results before... Just like with automotive enamel, even if it's still in the cup, it hits a point, "kicks" and you have a solid block of paint.

I've also experimented with thinners, most of the colors recommend mineral spirits which takes as long if not longer to dry. If you use acetone instead you can get the stuff to dry in minutes, even in 45* weather, but a lot of the colors won't stay suspended in acetone, they'll separate out if you don't constantly stir/shake. I've found that using some acetone and some mineral spirits does seem to be a good compromise, the mineral spirits dissolves well in the paint, and the acetone and mineral spirits mix well.

Supposedly naptha works as a solvent/thinner where you need mineral spirits but evaporates/dries fast like acetone, I picked some up to try it but haven't had a chance to experiment with it yet.

FWIW, I'm usually spraying the stuff using an automotive type HVLP gun...
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Old 03-19-2011, 09:26 PM
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To add to this. The higher temp from the heater did nothing to speed up the drying/ curing. Any light from the heat lamp that shined/ reflected on the gloss surface dried, everything else remained tacky.. This is in a dark garage. I belive that if I left it out in the sunlight, it all would have dried. But the hardener did knock a few days off of a brushed/ rolled Rustoleum finish drying time
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