how do you purchase replacement smoothing tips?

It comes with at least 3 tips, you would not need a replacement for a long while.

Will this work with Polyethylene?

The staples will work if the base material is at least 1/8 inch in thickness. The kit does include tips for use with plastic welding rod ( available on Amazon ) for thinner pieces but it will require a bit of practice. The staples require that the legs be nipped and ground down which requires very careful use of the grinder to keep from loosening. Also the repair on polyethylene will be difficult to be made cosmetically perfect

ASIN	B0BBG4KJCF
Additional Features	Portable
Best Sellers Rank	#87,251 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #266 in Welding Equipment
Brand	VCTSELITY
Brand Name	VCTSELITY
Customer Reviews	4.4 out of 5 stars 1,221 Reviews
Handle Material	Plastic
Head Style	Pencil
Heating Element	Ceramic
Included Components	staples
Included components	staples
Item Type Name	Welding Systems
Item Weight	1 Kilograms
Manufacturer	VCTSELITY
Model Number	vf-54
Power Source	ac/dc
Power source	ac/dc
Special features	Portable
Specific Uses For Product	Repairing car bumpers, car fenders, motorcycles, kayaks, canoes, children's riding toys, recycling bins, and various plastics such as ABS, PP, TPO, and TPE
Specific uses for product	Repairing car bumpers, car fenders, motorcycles, kayaks, canoes, children's riding toys, recycling bins, and various plastics such as ABS, PP, TPO, and TPE Specific uses for product Repairing car bumpers, car fenders, motorcycles, kayaks, canoes, children's riding toys, recycling bins, and various plastics such as ABS, PP, TPO, and TPE See more
Style Name	Pencil
Unit Count	1.0 Count
Upper Temperature Rating	320 Degrees Fahrenheit
Wattage	220 watts

Upgraded 220W Plastic Welder,2 in 1 Plastic Welding Kit 1000PCS Hot Stapler Plastic Repair Kit With 100PCS Plastic Welding Rods and 6 Types Staples For Most Plastic Car Bumper Repair Kit

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