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Did you strain the paint ? I strain everything before it goes into my sprayer. I started doing this after finding small rocks in an unopened 5 of dryfall.
I also change and clean my filters very often, I know guys who will leave the same filters in for years and then get pissed when the tip keeps clogging. These same guys will run alkyd and latex through the same pump without even cleaning it very well.
Strain the paint and use new filters, good tips, clean guns, and a little thinning when needed usually works for me. Thats not to say that this batch of paint might not have been bad, the HO could have been setting on it for years before giving it to you to use.
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