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Building Tips and technical articles. => Paint and finishing => Topic started by: Tim Wescott on December 18, 2018, 12:57:25 PM
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Today appears to be my day for asking questions that should be obvious.
What do you do to store dope that's already mixed with thinner? If I use a jelly jar, the seal in the lid turns to goo because of the thinner vapors. If I use a cardboard gasket with a jelly jar, the thinner slowly evaporates.
I'm about to start painting...
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Could try one or more layers of plastic or aluminum foil over jar and screw on cap.
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I have also found that the glass jars from pickles, jelly, etc. do not seal well at times. Some are OK, others leak after a while. I have not seen obvious seal damage from the vapors but it does not take much damage to cause a leak. I will most likely get some of the metal cans for long term storage.
A local auto paint store has the metal cans in various sizes. I also save the empty cans of clear dope to store other colors.
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I just found these (https://www.amazon.com/Cans-Lids-Mixture-Storage-Measuring/dp/B07FNR4TLP/ref=sr_1_6?ie=UTF8&qid=1545166468&sr=8-6&keywords=empty+paint+cans). I think I'm gonna spring for 'em!
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Tim, I think the cans are the way to go. In addition to the lids of the jars leaking, there is the risk of dropping a jar on the garage floor.
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A word of warning. Cans are a perfect choice but you have to make sure the cans are unlined. Cans for latex paints are coated on the inside to prevent corrosion. If you store solvent based paint like dope your paint wjll be ruined in a short time. Get your cans fron an auto paint dealer and be sure to inqure if tbey are lined. I ruined an entire gallon of clear dope and didn't rezlize it until I sprayrd a model with it. Dope didn't harden and was like sanding rubber to get it off.
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A word of warning. Cans are a perfect choice but you have to make sure the cans are unlined. Cans for latex paints are coated on the inside to prevent corrosion. If you store solvent based paint like dope your paint wjll be ruined in a short time. Get your cans fron an auto paint dealer and be sure to inqure if tbey are lined. I ruined an entire gallon of clear dope and didn't rezlize it until I sprayrd a model with it. Dope didn't harden and was like sanding rubber to get it off.
Oops -- stuff is already ordered. Was it obvious that it was lined, or was it clear?
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I really don't remember Tim. I have seen some that have a greyish looking interior at a Home Depot though. The clear dope I ruined didn't appear any different. I noticed it after I has about 3 coats on and started sanding. This was when I was clear coating. I was a very unhappy camper.
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FWIW, my favorite mixing jars are Tostitos salsa jars, they're a nice convenient size with a wide mouth for both filling and pouring, never had any issues with the seal either. Christmas and Super Bowl party season is fast approaching so it should be easy to add some empties to your stockpile. ;D
As another thought, I've never tried it, but maybe a good thing for longer term storage would be to put the sealed jar inside a Ziploc baggie?
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Using canning jars for mixing, thinning and storing dope I use parchment paper between the lids and the jar. Yes the dope does eat the rubber seal. I have tried wax paper and the clear backing off Monokote, both no good for me. D>K
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I use large metal cans quart and half gallon to decant Randolph typical gallons into... cuz the typical gallon paint can is a royal PITA to deal with
Mixed and thinned dopes get put in 4 or 8 oz Ball Pickling jars with wide mouthed lids marked...Parchment or Tin foil to stop the thinner from farkling up the rubber seal
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Once I open a steel dope can, I transfer it to a glass or a Nalgene HDPE bottle. Dope seems to be corrosive and rusts, more so when partially filled because of the air present. For mixed dope, I finally broke down and bought glass jars with teflon seals from McMasterCarr. See: https://www.mcmaster.com/glass-jars (https://www.mcmaster.com/glass-jars) Pricey, but I think worth it.
For storing thinner, I've been using empty drug store acetone and the 90% rubbing alcohol bottles. The acetone and rubbing alcohol is used for cleaning parts/stripping tissue.
NormF - lifetime doper.