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Baking paint in oven?

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Gene Davis (Ga.

11-21-2007 19:24:22




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I painted all the shrouds on a small engine this week and it was cool so the Rustolem enamel did not want to dry. The primer dried nicely in about 2 hours but the enamel was still soft and would show a finger print today, 4 days later. I sprayed it lightly to cover the finger print hoping it would flow together nicely. Then I took it in the house and put it in the oven of the wife's stove at 150 degrees and baked it for an hour. She wasn't too happy, but I had it cooking before she got off the telephone and discovered what I was doing!! The paint was smooth and dry when it cooled. Any body know what the proper temp and time might be for doing this sort of thing? Considering getting an old stove to use for just this sort of thing. Would the paint be any more or any less durable done like this? Does this qualify as "baked on Enamel"?

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B-maniac

11-23-2007 17:57:38




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 Re: Baking paint in oven? in reply to Gene Davis (Ga.), 11-21-2007 19:24:22  
Better listen to Glennster , below!! Why do you think paint booths have "explosion proof" everything? Maybe if you wait 4 or 5 days you can get away with it , but if you put it in while there are still solvents evaporating out of the paint film , you may as well put a bomb in that oven and stand back!! Most bake booths use infrared "curing" lamps which cure the film from the bottom out which lets the solvents out as apposed to trapping them in like what you intend to do with the oven thing.There's no free lunch with paint. The object must be 70+ , spray at 70+ and let set at least 2 days at 70+! Longer with uncatylized paints. Too much heat can be just as detrimental as not enough.

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TGS

11-23-2007 16:22:50




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 Re: Baking paint in oven? in reply to Gene Davis (Ga.), 11-21-2007 19:24:22  
The byproducts emitted from paint in an oven are toxic. Polyethylene plasticizers are not flavor enhancer for meatloaf.

All the same, alkyd enamels can be "force dried" by placing in a convection oven @180F for 30 minutes. These types of paints are not to be confused with "baked" finishes. Baked finishes cure by "cross linking" of the composite resins that occur once the metal itself attains a temperature of 300F for a minimal time of ten minutes.

In any case, most of the solvent must be evaporated out of the paint film prior to heating. Industry standards are 10-15 minutes of flash time at room temperature before heating to prevent pinholes from developing in the finish.

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bil b va

11-23-2007 12:07:45




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 Re: Baking paint in oven? in reply to Gene Davis (Ga.), 11-21-2007 19:24:22  

i watched a guy use a propane torch to dry a motor cycle gas tank in cold weather he had just painted . seemed to work just fine . was dry to the touch in about 10 minuites. i think he preheated the tank first .he was careful not to get the flane close and keep it moving . might be something you could experment with on a a piece scrap metal or some unimportant thing .



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glennster

11-22-2007 05:31:35




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 Re: Baking paint in oven? in reply to Gene Davis (Ga.), 11-21-2007 19:24:22  
at my shop we have a downdraft baking booth. generally we bake paint at 140 degrees, usually a 30 minute or so bake cycle, then a gradual cool down. you are probably in the ball park, maybe just a tad bit hot.



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glennster

11-22-2007 05:35:02




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 Re: Baking paint in oven? in reply to glennster, 11-22-2007 05:31:35  
opps for got to add, you have to be careful for fume build up from the thinners /reducers in the paint, as they flash off during baking, they can build up and possibly explode in mommas oven. she would prolly blow a gasket if you nuked her kitchen. also not the best to breathe in the vapors too.



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Dick L

11-22-2007 04:37:05




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 Re: Baking paint in oven? in reply to Gene Davis (Ga.), 11-21-2007 19:24:22  
Wives are funny that way. I had better luck using the oven to dry paint before I remarried. Seems to be a no no now. When I did I set the oven on warm and never check the exact tempter. After a few batches you can detect a paint oder in the house when you first come in but after you are in the house a few minutes you get used to it. (:^D
If the wives didn't have something like that to instruct us not to do we would not be able to use the oven, dishwasher, washing machine or her vacuum cleaner for other dumb stuff.

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old

11-21-2007 19:42:18




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 Re: Baking paint in oven? in reply to Gene Davis (Ga.), 11-21-2007 19:24:22  
That temp was to hot. Baked on in places I have worked at before was more like 90-100 degrees or so. Also infar red light does better then other types. One place I worked said baked on but the paint booth only had infar red lamps and it wasn't all that hot in the booth just a little warmer then the rest of the building

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Chris Van der Vyver

11-22-2007 20:31:08




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 Re: Baking paint in oven? in reply to old, 11-21-2007 19:42:18  
Rather than open a new thread, you guys seem to be on a similar one.
I would like to set up a paint booth in my barn this Winter to repaint my Oliver. If I get it nicely heated up in there with regular 220 industrial fan heater or oil-filled rad, how long until I can let the Winter back in? Til the paint surface is touch dry or longer? I doubt wife will allow large bits in the living room, altough I have snuck in water pumps and carbs to rebuild in the kitchen ;-)
It can get down to zero F and worse at times up here in Ontario.

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old

11-22-2007 21:41:05




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 Re: Baking paint in oven? in reply to Chris Van der Vyver, 11-22-2007 20:31:08  
You needs to keep the temp at 70 degrees F for at least 24 hour. If you can keep ot that warm or even better your in good shape.



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Gene Davis (Ga.)

11-22-2007 17:16:08




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 Re: Baking paint in oven? in reply to old, 11-21-2007 19:42:18  
Thanks guys for the help. Gene



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