Posted by a reviewer on Amazon

If the tube is slightly miss shaped as many of mine have been straight out the box it can be difficult to get a good air seal

Posted by a reviewer on Amazon

This gun arrived next day and i set about trying it out with a tube of evostik superstrong building adhesive that does not flow particularly easily unless you have a really strong grip i was initially very disappointed with the performance of this gun as no matter how hard i tightened the end cap the threads would not perform an effective seal and leaked a significant amount of air

Posted by a reviewer on Amazon

I have tried this unit with some very thick adhesive that was quite difficult to squeeze out of the normal applicator gun

Posted by a reviewer on Amazon

The body must be firmly screwed into the handle section to create a seal on the internal thick rubber washer and the end of the chosen sealer tube

Posted by a reviewer on Amazon

I bought one for 70 quid and sent it back because it wasnt as good as this

Posted by a reviewer on Amazon

There are a couple of issues though

Posted by a reviewer on Amazon

Just make sure your tube ends are not squashed so that they make a good seal otherwise your wasting your time