MGA PAINT TECH has no great detail about body finishing, but good stuff on painting the engine and chassis as well as undercoating and rustproofing.

PT-101 - A quick synopsis on ENGINE PAINTING, colors and techniques.
PT-102 - Painting the ENGINE BAY and other chassis colors.
PT-103 - PAINT(S) for the MGA BODY SHELL
PT-104 - WHEEL PAINT for the MGA

PT-105 - PAINT CODES, BODY & Interior Colors
PT-105A - PAINT CODES for AUSTRALIAN MGA
PT-105B - PAINT CODES, Other Than Body Color
PT-105C - But WHY ARE THEY ALL RED?

PT-106 - Parts That Are NOT BODY COLOR
PT-107 - Things That Are BROWN
PT-108 - os - Factory Colors for MGA 1500 cars (photos)
PT-108A - os - Factory Colors for MGA 1600 cars (photos)
PT-110 - BRITISH RACING GREEN (For MGA)
PT-115 - PAINT OVER PIPING - Ahrrrruuuug !

UC-201 - The basics of UNDERCOATING and RUSTPROOFING
UC-202 - Discussing the chore of UNDERCOATING REMOVAL
UC-203 - os - Internal restproofing during restoration