Does it work on cardboard tubes?

My experience was it was good for plastic tubes. But absolutely did not work on paper tubes. Would not recommend if using any type of tube other that plastic. Hope this helps!!!

you claim it stops flowing when you release the trigger....aha sorry no it doesn’t and I was stupid enough to purchase another with the same results

After working with this for a while now I have pretty much fixed this issue. It's an extra step but works for me. I've found out the tubes are just too smooth and the rubbers don't have anything to grip to pull it thru. So to fix this I just laid two strips of duct tape vertically down either side of the caulk tube. The strips of duct tape now help the gu. To grip the tube. AND NOW it stops the flow and pushes the caulk out with zero effort! I sure hope this helps others and also gets the manufacturers attention as well.

SInce it looks like it slices the tube, can you save a partial used tube? Will it still be sealed at the back end?

Same thing happened to me, but after 2 tubes. Save your money.

Does this have the thin metal seal punch some caulk guns have?

Yes, it has a separate piece of wire that is stored in the handle. that you can take out and use to open the seal on the caulking tubes. It works okay, but seemed a bit fiddly to get out and put back into the handle, so it was easier for me to just use the heavier punch on my old standard caulk gun.

Brand	SILIGUN
Product Dimensions	20.57 x 13.72 x 8.64 cm; 294.84 g
Are Batteries Included	No
Item Weight	295 g

SILIGUN Caulking Gun - Anti Drip Extreme Duty Caulking Gun - Patented New Innovative Design - Lightweight ABS Frame - For Smallest to Maximum Work - Compact - Only 4"/0.65lb Design (1)

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