EverCoat Feather Fill G2 Resistance to Rock-Chipping & Flex-Cracking ?

S

Silver 7T8

How Resistant to "rock-chipping & flex-cracking" is Evercoat Feather Fill G2 when applied over SPI Epoxy ?
Substrate: Clean Bare SMC Fiberglass (1978 Corvette)
2 - Rounds of SPI Epoxy (Black) block-sanded between coats.
2 - Rounds of Feather Fill G2 (Gray) block-sanded between coats.

MAIN QUESTION :
Should the Feather Fill G2 be block sanded to minimal mil. Thickness ?
Some photographs on this FORUM show "Poly High Build Primers" aggressively sanded until major amounts
of the under-laying epoxy are showing through the Poly-Primers such as EverCoat Feather Fill G2.

Would minimum mil. Poly-Primer thickness over SPI Epoxy be more chip & flex resistant, especially on front leading-edge body panels ?
Thank You to every one who contribute on this GREAT Forum.
 
I've found the chip resistance and crack resistance to be very good when epoxy has been applied below and over the poly primer. Not as good as epoxy alone but shockinging good considering. My Son has done some extreme tests on plastic bumper covers that were a real eye opener. Epoxy primer is the key though IMO I wouldn't strive for a minimum film thickness-just cut off whatever isn't needed.
 
Its pretty good about flexing as Bob said but I tend to see shrinkage with poly primers after the job has fully cured and you may have to go back and sand/buff some sand scratches out after 90 days or so
 
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