Not sure it's a definitive guide, but I've got one chrome and one holochrome nail on each hand, and not had any wear after 8 days... here are my nails as of this afternoon:
This is what I did and the products I used:
Chrome nail:
1 x Shellac base coat
1 x Shellac Original top coat (added for strength - those are my natural nails)
2 x Shellac Safety Pin
1 x Shellac Original Top Coat
Remove tacky layer with dry lint free wipe - I didn't scrub too hard, just wiped a couple of times.
Apply Magpie Tiara with eyeshadow applicator, and burnish to a shine
2 x thin Shellac Original TC to seal, capping the free edge thoroughly on both layers
Holochrome nail:
1 x iLac base coat
1 x Fortify (again, added for strength)
3 x iLac i-84, True Blue
1 x iLac Rock top coat
Remove tacky layer with dry lint free wipe
Apply Spectraprism with eyeshadow applicator, and burnish to a shine
2 x thin iLac Rock top coat to seal, capping the free edge thoroughly on both layers