In most cases a successful solvent cement joint can be made without using a primer/cleaner. But, if you want to increase probability of making a successful joint, using a primer/cleaner is the thing to do.
Purple Primer accomplishes two things. First, it will clean the pipe and fittings of any dirt, oil, grease and other foreign matter. If the plastic is dirty before making a connection it will be more difficult for the cement to bond the pipe and fitting together. Second, Purple Primer will soften the plastic. This allows the cement the opportunity of skipping a step (softening the plastic) and to go immediately to the process of fusing the pipe and fitting together. Note - softening the plastic in cold weather is especially important because it will noticeably speed up the process of making a solvent cement joint.
Using Purple Primer is always recommended to make a good connection. And remember, in most locations using a primer/cleaner is mandatory according to local codes.
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