You have worn or broked o-rings/seals inside the gun. The Finish Pro 32 is one of Senco's older guns and they no longer offer a repair kit for this gun. You have to go to a site like
www.senco.com or
www.ereplacementparts.com, find a breakdown of your gun and order each part you need. If you are going to rebuild the gun order all the o-rings/seals (Senco parts that start with LB) and any other parts that may be damaged like the piston stop, springs, etc. Lubricate the o-rings with light grease as you put them in and make sure to oil the gun regularly when you are using it to make your work last.
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