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OAUSA Net - October 15, 2020 - Automotive Adhesives I and II

Posted: Fri Oct 09, 2020 5:20 pm
by toms
Our net this week will be of particular interest to those who travel to remote locations where your usual repair service is not available. It is in these locations where the prepared traveler needs to be self-sufficient and ready to make his own repairs. But, make no mistake about it, anyone who works in his garage, works on his own vehicle, or is just handy around the house, will benefit from this net.

Kevin Paulson, KK6DGL, will be our guest this week and will be discussing various adhesives, thread lockers, repair compounds, silicones, and other products which should be in everyone's gear bag. These same products will come in handy for all your home repairs as well. Kevin's expertise in this area is impressive and the net will offer valuable information for just about everyone.

Re: OAUSA Net - October 15, 2020 - Automotive Adhesives

Posted: Sat Oct 10, 2020 9:33 am
by KAP
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Modern vehicle makers take advantage of the the many Engineering benefits of adhesives to Manufacture and repair today’s cars, trucks and other wheeled equipment.
Auto repair shops and collision centers use many of the same products to return vehicles to a road worthy condition.

Benefits of adhesives include:
1. The bonding of multiple substrates that can’t be welded or
2. Sealing body panels
3. Locking/sealing threaded fasteners
4. The stiffening of light weight body panels used to
Increase fuel economy.
5. Sealing engine and drivetrain components
6. Assembling and sealing electrical components &
Circuit boards
7. Prevent corrosion
8. Increased crash safety

Topics of discussion:
Safety equipment
Surface preparation
Adhesive chemistries
Vehicle applications
Additional adhesive options

Re: OAUSA Net - October 15, 2020 - Automotive Adhesives

Posted: Sat Oct 10, 2020 9:34 am
by KAP
Safety equipment should always be included in any auto repair kit. Eye and skin protection are of particular importance, especially working under or in a vehicles engine compartment.

Basic equipment includes:
1. Eye or full face protection
2. Gloves- both leather and nitrile
3. Dust mask

1. Use adhesives in a well ventilated area.
2. Keep adhesives away from open flame or
Heat sources.
3. Avoid skin exposure. People can become
Sensitized to certain adhesive chemistries

Basic safety equipment
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Re: OAUSA Net - October 15, 2020 - Automotive Adhesives

Posted: Sat Oct 10, 2020 9:57 am
by KAP
Surface prep goals and considerations:
1. Surfaces should usually be clean dry and rough
2. Try to maximize the bond area

Joint design
1. A Lap joint is better than a butt joint
2. More width is better than more overlap.
3. Verify the environmental conditions a particular adhesive will experience to mitigate failure
4. Select an adhesive chemistry that will meet the
Substrate and joint requirements. Use a flexible
To bond a flexible joint.

Re: OAUSA Net - October 15, 2020 - Automotive Adhesives

Posted: Sat Oct 10, 2020 10:18 am
by KAP
Adhesive chemistries(categories):
Two Part Structurals
Solvent Based
Cyanoacrylate(C/A’s, Superglue)
Anaerobic thread lockers
Elastomers- RTV silicones and polyurethanes
Adhesive tapes

*Important note of Caution:
Always use those products specified by the manufacture if one is available.

Re: OAUSA Net - October 15, 2020 - Automotive Adhesives

Posted: Sat Oct 10, 2020 10:44 am
by KAP
Rear view mirror bonding
Tire repair
Sealing of electrical components
Preventing fastener failure
Sealing from weather
Assembly of off road equipment( storage, camp kitchen, tools, etc)
Adhering navigation components and accessories On and around dashboard
Emergency sealing of radiators and hoses, fuel tanks and differentials
Vehicle fabric repair

Re: OAUSA Net - October 15, 2020 - Automotive Adhesives

Posted: Sat Oct 10, 2020 12:28 pm
by KAP
2- Step Acrylic Structurals

These adhesives include rear view mirror and rear window defogger glues.
1. Include an adhesive and a catalyst.
2. No mixing is required.
3. Very high strength
4. Handle vibration and shock
5. Excellent magnet bonder
Rear view mirror adhesive is a fantastic magnet bonder.
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Re: OAUSA Net - October 15, 2020 - Automotive Adhesives

Posted: Sat Oct 10, 2020 12:28 pm
by KAP
Solvent Based adhesives include the following Tire plug, Weather strip, Contact cement including Headliner Sprays and Vinyl and fabric Products.

1. Usually single part
2. Required to “Air Dry”
3. The solvent could be water or petroleum based
4. Very flexible and bond a great variety of substrates
5. Medium to high strength depending on substrate
6. Can be flammable
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I prefer tire repair kits that include an adhesive as it helps to lubricate and fill small irregularities when applying the plug. The adhesive is solvent based and offers almost immediate use. Great to have with you on the trail.
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Re: OAUSA Net - October 15, 2020 - Automotive Adhesives

Posted: Sat Oct 10, 2020 12:28 pm
by KAP
Cyanoacrylates, also known as C/A’s or simply Super Glues bond a great variety of surfaces
but do have some limitations.
1. Most have Low heat resistance
2. They tend to be brittle although some are rubber modified
3. Will bond skin instantly so gloves are advised
4. Generally poor environmental resistance.
5. Require a very thin bond line to cure properly
6. Hybrid versions offer some great advantages.
7. Baking soda, powdered aluminum or other fillers can be used to increase the
strength and to facilitate the cure in open air.

Baking soda can be added to C/A’s to fill gaps and reinforce a repair area.
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Re: OAUSA Net - October 15, 2020 - Automotive Adhesives

Posted: Sat Oct 10, 2020 12:30 pm
by KAP
Anaerobic Thread lockers are the best way to ensure fasteners maintain clamp load and also offer
the benefit of lubricating and then sealing the threads to prevent rust and corrosion.

1. Available in low, medium and high strength and different viscosities.
2. If in doubt, use blue as it holds very well in all but the highest vibration and shock load
applications but is easily removable with the same hand tools you put the fastener on with.
3. Impervious to almost all chemicals
4. Can also be used between flat, bolted surfaces to prevent side sliding.
5. They are not glues but a liquid plastic that solidifies to fill the pours of metal surfaces to create
additional friction.

Chemical thread lockers are designed to fully fill the air space between the threads and create friction.
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2-3 drops on a 3/8” fastener is sufficient to prevent failure
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To properly secure this wheel spacer, I used Loctite 263 red thread locker on the studs to secure it to the hub. Then I added Loctite 290, water thin thread locker between the hub and spacer. It will not come lose until heat is applied. Rust or corrosion is also eliminated
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