Continued from Page 22
Corrosion Protection
Let’s see what some of the OEMs state about the use of weld through primers. Toyota wants zinc-rich weld
defend yourself in a court of law. Going forward, list each item you used in the repair process. If you do not want to list each item, use a line that states “for all corrosion protection products used in the repair, please see attached invoice.” See Fig. 3 for example of an invoice for a quarter panel replacement using the PROS program from Kent Automotive.
applied to all bare metal surfaces before body filler, adhesives, urethane primers and seal sealers are put on. Honda says that the EP can be applied with a spray gun, roller, foam brush or a dobber. (Fig. 7) Nissan, Ford, GM, Audi and Mercedes-Benz recommend the use of epoxy primer to all bonding surfaces prior to the application of adhesives.
body fillers and seam sealers. The next sets of primers are colored self-etching primers (Fig. 8b). These primers are used on interior sheet metals that are different colors
Fig. 5, Weld Through Primers
through primers on all mating surface. Honda states you will use weld through primer on all mating surfaces that will be spot welded, but no WTP when MIG plug welding. Fiat Chrysler states it does not want weld through primer used on its vehicles.
Fig. 3
I think we need do a tutorial on the many corrosion protection items used in the repair process and what the OEMs state in their repair manuals. Fig. 4. You can see a number of items on the Kent Automotive corrosion protection cart. There are several fine companies that make these products, but I am most familiar with the Kent line.
2K Direct to Metal Primer This primer is a two-part direct to metal system. It is the closet product to factory applied electrodeposition primer. It can be used as a bare metal primer, high build primer and/or a primer surfacer. (Fig. 6)
Fig. 8b
Fig. 8a
Self-etching primers (Fig. 8a) are used on bare metals. The primer contains phosphoric acid and should not be used where glass adhesives are applied. If the acid is not totally cured or a seal coat is not applied, an adhesion failure will most likely occur. The same scenario applies to
than the exterior of the vehicle. The same rules that are applied to regular self-etching primers pertains to these primers. Cavity wax (Fig 9) is a semi hardening or a hardening material that will “creep” into seams, folds and hems to seal off the parts from moisture and air. This product is applied after the vehicle has been painted because paint will not stick to it. Toyota says in CRIB 1997 it will be applied to the inside of new doors,
Fig. 6, 2K Direct to Metal Primer
Let’s look at what the OEMs state about epoxy primer. Toyota and Honda want a coat of epoxy primer
Choose Original MINI Parts. Illinois
Michigan
Patrick MINI
MINI of Grand Rapids
Schaumburg 847-605-4055 (847) 619-4511 Fax Hours: M-Sat 8am-5pm patrickMINI.com The Dealers Above Are Original MINI Parts Distributors
Fig. 4
Weld Through Primers These primers are used between mating surfaces. You can use copper-based (with zinc) or zinc-based. (Fig. 5)
Grand Rapids 888-708-1359 (616)-452-1101 Fax miniofgrandrapids.com
Fig. 7
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