I ended up having to re-sand the sikaflex and went ahead and also did the frame.
I decided to try spraying on a water borne exterior latex from Sherwin Williams using an HVLP touchup gun.
It went on very well but it looks like the paint is taking a very long time to fully cure on the sikaflex.
The Harbor Freight HVLP gun - paint had to be thinned quite a bit.
Practice.
Primer coat:
Satin Black: