Weld-On P-68 PVC/CPVC Primer ensures that your pipe joints are strong and well fused. Compatible with all schedules, sizes, and classes of PVC and CPVC pipes and fittings, this non-bodied pipe primer (when combined with solvent cement) has a penetration rate that is more rapid than that of solvent cement alone. Once applied, it acts quickly to soften the joining surfaces, helping to promote maximum fusion during welding. Follow with the solvent cement of your choice to achieve a strong, high-contact, and long-lasting joint. Contains (concentration percentage by weight): Tetrahydrofuran (20-35%), Methyl Ethyl Ketone (15-25%), Cyclohexanone (10-30%), Acetone (25-40%)