Thinking backwards, the thumb lock is in the front. If you don't constantly depressurize, the flow will continue to be a mess. Only suitable for thin liquid sealants (latex or silicone). Your hand will explode if you use anything else, and even then it will take effort. I do this for a living and if you can use a regular 12 to 1 shotgun you have more control. This weapon is great for close-range work, but fire slowly for best results. It shouldn't be fired if you're going fast.
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