I mixed a #60 bucket of joint compound (about 4 gallons) with 1 gallon exterior black latex paint. The mixture turned out grey. Make sure to pick up the drill attachment - I don't think I could've mixed it without one! The mixture and fabric are quite heavy - make sure your frame will hold it while wet. I was hesitant to try this but it worked GREAT and I am now working on another frame. I may try a white one - has anyone done that? Good luck~
For the sake of your arms, clothing, and the ground you work on, please use an attachment to mix this stuff up. The first time I made it, I thought to myself, "How hard can it be to mix?" The answer: hard. I broke multiple stirring implements, sloshed it all over myself and the floor of the garage, and did not do a thorough mixing job even after going at it for 30 minutes. Then came the joy of peeling it off my skin after it started to harden in dry hot weather.
The real fun was getting to the bottom third of the bucket and realizing the paint never made it that far down.
Make sure you're using a sturdy enough drill. The mixture is very very thick, dense, heavy, and resilient. You will risk burning up the motor of a weaker drill because of the resistance and extra torque against the drill. If you need to, borrow a friend's drill, or if you're doing large projects and many buckets, go rent an impact hammer drill for a weekend. I have a Milwaukee 1/2" concrete drill, and a small Black & Decker 3/8" 9.6V battery operated drill. You can guess which one won't handle the job. (And don't forget to check the clearance sections in Lowe's or Home Depot, they always have good drills out-of-box to get rid of for cheap!)
And don't be afraid of adding a little water (just a paper Dixie cup at a time) to thin it out and make it more manageable to mix. The water will evaporate away. But if it's dripping freely off the materials you use, it's too thin. It shouldn't drip like wet paint, it should still be thick like pudding.
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