BenzWorld Junior Member
Date registered: Oct 2004
Location: Toronto, Ontario
Mentioned: 0 Post(s)
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RE: attaching lip spoiler
Hey guys, I was an Adhesive rep for 3M for almost 5 years, until recently.... when I stopped to start a private family business.
First off, the 3M Automotive tape should work well. Most OEM mouldings are attached with this tape. It has enormous dynamic strength. However, it MUST be installed properly. The 3M tapes used in the automotive sector generally have differential adhesives. In other words, since one usually attaches to plastic, and one to metal... the side that attaches to plastic is a softer adhesive the side that attaches to the metal/paint is a stiffer adhesive.
The stiffer adhesive offers better overall hold on good to bond surfaces (such as car grade painted metal). The softer adhesive is necessary to bond to the plastic surface because plastic is more difficult to bond to, thus it needs a softer adhesive technology. In order to increase the adhesiveness on the plastic sections, you can use an adhesive promoter. MEK can be used if you have trouble finding an appropriate 3M promoter. Before applying the primer (promoter), you should scuff up the plastic with a light abrasion with scotchbrite.... clean off the dust.... then apply the promoter.
On the paint, you should clean it with IPA (Isopropyl Alcohol = Rubbing alcohol). This will NOT damage the paint, it will only clean things like wax and other potential contaminants.
DO NOT use WINDEX or similar products to clean. They have materials that prevent bonding.
You can use one of the Industrial Tapes if you have a difficulty finding one of the Automative Tapes. The Industrial tape you should try is VHB 4941 (45 thou thick), 4956 (62 thou), 4991 (90 thou - probably too thick..... all 3 are the same material... just different thicknesses), if the spoiler is made from ABS, PC, or rigid PVC. If it happens to be made of PE or PP (I doubt it) let me know. You can get the Industrial version at a place like RS Hughes. http://rshughes.com/ (they can sell you a single roll 1/2", 3/4" or 1") The other nice thing about the industrial product is that it doesn't have a differential tack adhesive on both sides... so you don't have to worry about which surface to attach the appropriate side of the tape.
Conversely you can try to get one of the automotive tapes through one of the Paint/Body shop distributors. I don't know who the 3M aftermarket distributors are down in the US.
More info: http://cms.3m.com/cms/US/en/2-169/cFzceFZ/view.jhtml
I hope that helps.
OH, BTW, if you want to be "Secure" about everything... you can add a liquid adhesive as well as the tape.... no pun intended. [:D]
If you have any questions, let me know.