Hey Toby! with Toby Chess
Toby Chess is an I-CAR program instructor, Training specialist, and former salvage yard operator. Toby is universally known in the collision industry for his work with first responders and advocacy for body shops and consumers. He can be reached at tcspeedster@gmail.com
An Overview of Corrosion Protection Products: Part 2 of 2 applied. Seam sealer tape can be removed and repositioned until it is firmly pressed into place with a roller (See Fig. 15) which sets the adhesive.
This is the continuation of Corrosion Protection: Part 1, printed in the August issue of Autobody News.
will lead to an adhesive failure.
California Autobody Association with David McClune
Fig. 14
DTM sealers (Fig. 14) have the same characteristics as the generally Single part seam sealers (Fig. used seam sealers, but has corrosion 12) are an NVH control material. Its inhibtors added so it can be applied to John Yoswick bare metal. primary purposewith is to keep out moisNo OEMs recognize the use of ture, wind and sound, and it is used on all joined metals. It dries by at- these seam sealers. They all state tracting moisture and will take longer there needs to be a barrier coat beto dry than two-part adhesives, gen- tween the bare metal and the seam sealer, perferably 2K epoxy primer. erally speaking. A friend of mine used a compa Every OEM for which I have corrosion data requires a primer to ny’s DTM seam sealer with no primbe applied prior to the application of er on a new roof panel. The vehicle returned with all of the seam sealer seam sealer. lifting off the panel. He contacted with Richard Steffen the manufacturer of the product and they would not warranty the repair. They said he did not follow OEM procedures, which stated a coat of epoxy primer was needed to be applied prior to the application of the seam sealer. I just want you to be warned before you apply this seam sealer to bare metal.
Fig. 17
Fig. 12
Year in Quotes
Fig. 16
Make sure you clean the primed surface with a good wax and grease remover such as Acrysol (Fig. 16). Using your thumb to put the tape in place and not cleaning the surface
Collision Repair Association of CA.
Transition Planning with John Yoswick
Fig. 13
Two-part seam sealers (Fig. 13) are used just like the single component. They have a faster drying time than single-part sealers, but cost more. Control flow sealers are used in areas where a flowable self-leveling type seam sealer is required, as Fig. 15 The next type of seam sealer is it flows up to 2 in., then cures, pre- in the form of tape (Fig. 15). Comventing further with flow. Self-leveling Karyn Hendricks sealers are recommended for roof mon locations of use are the hood seam sealing and on drip rails and hem, door hem, deck lid hem and trunk opening seams. A fast drying, quarter panel arches. There is no dry non-sag, high build sealer is used for time so you can paint immediately. Do not stretch the tape as it is all other areas that need seam sealer.
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Sound deadener (Fig. 17) is a two-part material used for noise, vibration and harshness. It can be used to fill large gaps, but I teach using it as an adhesive between the outer door skin and intrusion beam. Work time is about an hour and it is a non-expanding material that works well on horizontal as well as
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34 SEPTEMBER 2020 AUTOBODY NEWS / autobodynews.com
with David M. Brown Midwest_Issue_0920.indd 34
8/17/2020 7:40:25 PM
