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Actually, there are several surface prep methods that will greatly enhance bonding by altering the surface molecules. http://www.masterbond.com/bssp/bspolye.html has a discussion of techniques, ending with a couple of chemical products they make on a wholesale basis.
Hot melt adhesives can work well, and are available for hobbyist glue guns. Bostik 6384, 6390 specifically specify PE in their description.
Penguin Cement http://www.sunstarea.com/index.php?option=com_content&task=view&id=13&Itemid=27 include commercial adhesives used in the automotive industry.
Loctite is rumored to have an epoxy that will bond to PP. The Loctite® All Plastics product (activator followed by cement) is labeled for PE and PP.
Addendum by another contributor: I have used Loctite Super Glue Activator on polyetheylene sheeting (a rink liner with a hole). The bond seems very strong (a patch of sheeting attached to damaged sheet). The bond is strong enough to tear the sheet before peeling off (on a test piece of course; I didn't rip open my rink liner!)
Tech-bond http://www.tech-bond.net/Debonders_Accelerators_Gels.html sells a chemical prep solution via internet (note that they also bond Teflon).
I'm sure other brands exist. Dow Corning makes several saline compounds that are great additives for adhesives that need to bond to organic polymers so formulators (e.g. tech-bond) should be providing solutions.
I also used an automobile headliner spray adhesive as an underlayment for attaching self stick reflective numbers to my PP mail box and that's held up well for 2 years.
(I have no interest in any of the above companies; this is just a result of my Google searches for 'will bond to polypropoline' (sic) -- more hits than using the correct spelling. polypropylene.)
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VHB stands for Very High Bond tape which is a form of super adhesive tape. It is used in place of screws or rivets, forms a permanent bond and is weatherproof.
