intercoat

HI guys, I painted my MX-3 a few weeks ago and it looks great besides the passenger side near the bottom of the door and rocker. I had less lighting on that side and I can see I needed another coat of base there. Today I plan on prepping it and spraying it in the morning in my garage. Question...

can I spray a coat of spi intercoat over my blend panel, then throw Nason over top, or no? I usually use Nason on cheap jobs and bump up to chromabase for others, so can either of these be sprayed over spi intercoat? Also, would blending a solid red be challenging at all? I'm assuming since...