Well yellow is a tricky color and dbu is different then dbc but it can be done
First question is what are you doing? I need some more info before I can answer that question properly.
But I would think if you were painting a door you should be able to blend fender and quarter and be ok.
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There are various issues with the current paint job, I have a thread about all the issues: https://www.chevelles.com/forums/12-...ld-you-do.html
If you don't have time to read thru all of that, the short version:
1) Need a set of new (used doors but never had rust) blocked out and painted, blended with qtr's.
2) Vertical side of both front fenders are not flat, need to be blocked out and blended with top of the fenders.
3) 66 SS hood inserts, have a good used set that are not all warped like my old ones, hoping the color match is good enough to panel paint these.
4) Passenger side top of qtr has a patch that is bubbling as back side of weld was never dressed, was left bare welded steel. Would need to dig out all the paint & filler on top of that patch and blend, dress the back side of the weld.
5) Roof skin right above rain gutters is wavy (from stress relieved spot welds I did with a MIG when replacing the roof skin, we are guessing, was flat after the paint job 15 years ago) would need to be blocked and blended.
Painter told me a lot of that stuff could be fixed without a huge number of hours, but he is reluctant because the paint will not match, and he won't be able to blend, and of course will not be able to panel paint anything. He won't take my money for that job due to risk of a paint match issue.
He wants $20k for a full re-block and repaint of the entire outside of the car (less the jams, leave the current DBU there), $4000 for Standox materials, and $16k for the ~300 hours for the blocking prep & paint. I'm told if the fixes could be done with paint that matched perfectly, I could fix the car for around $8000. So for me, it's $8000 vs. $20,000 if I had a gallon of DBU per the mix code. Which I "kind of" have... Sounds like the risk is too great to use that paint.