Weld-On 10209 P-68 Clear Primer 1 qt is a code compliant, THF-free primer with 30% lower solvent emission rate and significantly reduced odorous fumes than the current products in the market–resulting in an improved workplace environment for pipe installers. The P-68 PRIMER is a clear or purple, ultra low VOC, fast acting primer that rapidly softens and dissolves the joining surfaces of PVC and CPVC pipe and fittings prior to the application of solvent cement.