The best angle for blasting depends on the surface and the operation. For rust, mill scale, and heavily pitted surfaces, uses an 80º to 90º angle of attack. When removing old paint, use a 45º to 60º angle. ... Rock Garnet Trading Sdn. Bhd. 929131-U Rock Garnet Trading SA0079856-X. Contact. No 8-1, Jalan Palma Raya, Bandar Botanic, 41200 ...