Priming & Blocking SPI Epoxy + FeatherFill G2

[Silver 7T8]

Hello ALL - Newbie Here - Your Assistance will be GREATLY Appreciated.

Looking for some priming & blocking guidance.
Working on a 1978 Corvette repaint - thus the substrate is SMC.
The original GM paint & primer were completely removed.
The original exterior body seam adhesive was ground out & replaced with Evercoat 870 Vette Adhesive /Filler.
The photo shown has 2-Coats of SPI Black Epoxy 3-Coats of Featherfill G2.
The panel is now very straight - BUT does have the sand through areas to substrate SMC.
(NOTE: The sand through areas have the blue-tape triangles on them - $.25 for size gauge.)
QUESTION:
Do I need to lay another coat of SPI Epoxy?
Reduced or Regular viscosity?
Next layer would be 2K or should I lay another round of FeatherFill G2? (Again it is NOW very straight)
Again ThanK YOU ALL EVER SO MUCH.
Silver 7T8 - Larry

 

[shine]

if you did not use resin and mat on the seams your going to have to start over. 870 alone will not do it. you use 870 instead of bondo to finish off with .

 

[crashtech]

I'd put one full coat of epoxy over the whole thing, and 2-3 coats of 2K the next day, or 2 coats of epoxy one day, and 2 more the next day. Then wait 48-72 hours and sand for paint. Don't use Featherfill for final blocking, it sands too hard and is not an ideal substrate for the topcoat.