Mirka 5" 28-Hole Grip Backup Pad with Pad Saver, 915GV28 3" grinding discs it throws off the mix

it throws off the mix ratio and it will not cure properly

Non‑ferrous metals

Perfect for use on interior plastic parts and hard to sand areas

Typically ships within 3 business days

Formulated with Zinc Omadine® for the most advanced slime control

Mirka 5" 28-Hole Grip Backup Pad with Pad Saver, 915GV28 3" grinding discs it throws off the mixProduct Description: Mirka 5" 28 Hole Grip Backup Pad (915GV28) features a 5" diameter size and 5 16" x 24 male thread attachment and medium density. For use with Mirka 5" vacuum sanders and 5" size grip hook & loop vacuum sanding discs. Manufactured using advanced molded polymers and highest quality construction. Perfectly balanced to eliminate vibration and provide superior finishing. Includes one Mirka #99528 5" multi hole pad saver. Features and