Key Takeaways
- The 3M 08690 is a one-part adhesive with high viscosity and is suitable for professional projects.
- The 3M 08693 has a medium viscosity, is more flexible than the 08690, and dries a little slowly.
- The 3M 08609 has the lowest viscosity compared to 08690 and 08693 and is easy to work with.
- The 3M 08509 has a pliable formula, meaning it is not a permanent adhesive but a flexible sealant.
There are many high-quality and permanent adhesives for sealing and repairing from 3M, leaving you confused and wondering which one to choose.
That’s why you need to check out today’s 3M 08690 Vs. 08693 Vs. 08609 Vs. 08509 adhesives to find the answer.
About 3M 08690 Adhesive
The 3M 08690 Fast Cure Auto Glass Urethane is a professional-grade adhesive with high viscosity to bond windshields, backlights, sidelights, and stationary glasses.
Due to its thickness, applying the adhesive is convenient because you can get away without making a lot of mess.
About 3M 08693 Adhesive
The 3M 08693 Auto Glass Urethane Windshield Adhesive is also a one-part adhesive and bonds a number of materials.
It has OEM strength, and its medium viscosity offers more working stability. This glue works best for replacement jobs.
About 3M 08609 Adhesive
The 3M 08609 Window-Weld Super Fast Urethane is a low-viscosity adhesive that is easy to apply and dries faster.
It is a powerful adhesive and bonds permanently. Moreover, it works well on painted and unpainted surfaces.
About 3M 08509 Adhesive
The 3M 08509 Auto Bedding and Glazing Compound is an exception here because it’s not an adhesive.
It’s a sealant made of synthetic rubber and is suitable for stealing bedding and gaskets. Also, it is not permanent and can be removed later.
3M 08690 vs. 08693 vs. 08609 vs. 08509
Adhesive Base and Effectiveness
The 3M 08690, 08693, and 08609 have polyurethane bases. This type of adhesive is strong, versatile, and creates a permanent bond.
However, the 3M 08509 has an oil base with petroleum distillate solvent. It’s not an adhesive but a flexible sealant that remains soft and can be removed later.
Bonding Materials
All 3 adhesives are great for fixing car windshields, front and backlights, drywall, cabinets, and most painted surfaces.
As for the 3M 08509, you can apply it on both wet and dry surfaces at 15°C to 30°C (59°F to 86°F) temperature. And it works well on rubber, metal, and glass.
Bonding Strength
When it comes to bonding strength as adhesive, both 3M 08690 and 08609 are ahead of the game with an impressive 1200 psi tensile strength.
The 3M 08690 has a tensile strength of 1000 psi, but it is almost as good as the other two when it comes to creating a strong bond.
Drying and Cure Time
Since the 3M 08509 is not an adhesive, it doesn’t have a drying or cure time because it always remains flexible and removable.
However, it takes 40-50 minutes to start working and takes 24 hours to take proper effect.
But the adhesives dry and cure as follows.
| Adhesive | Drying/Work Time | Cure Time |
| 3M 08690 | 10-15 minutes | 24 Hours |
| 3M 08693 | 10-15 minutes | 24 Hours |
| 3M 08609 | 10-20 minutes | 24 Hours |
But I must add that the drying and cure time of these adhesives can vary depending on the temperature and surface you apply them on.
Ease of Application
Due to its high viscosity level, the 08690 adhesive is the thickest and can be applied more precisely.
The 08693 is less thick compared to the 08690 and is also non-sag.
However, the 08609 is thin and slightly runny, which means applying it can easily create a mess if you are not careful.
As for the 08509 sealant, applying it is more flexible due to its consistency.
Cost Comparison
For your convenience, I have added the following table for the price difference of these adhesives.
| Adhesive | Quantity | Price |
| 3M 08690 | 10.5 fl oz | $23.07 |
| 3M 08693 | 10.5 fl oz | $19.82 |
| 3M 08609 | 10.5 fl oz | $32.58 |
| 3M 08509 | 10.5 fl oz | $35.99 |
But remember that the price can differ based on various factors. So you must check with the seller first.
What Is The Main Difference Between 3M 08690 Vs. 08693?
Their viscosity level is the main difference between the 3M 08690 and 08693.
The 3M 08690 has a high viscosity, which makes it thick while the 08693 has a medium viscosity and it is less thicker.
As a result, when it comes to filling gaps, the 3M 08690 works better, but it can be difficult to work with.
What Is The Main Difference Between 3M 08609 Vs. 08509?
The main difference between the 3M 08609 and 08509 is that one is a windshield adhesive while the other one is a non-permanent sealer.
You can remove the 08509 sealer as it always remains flexible and can be used to prevent leaking. But the 08609 cannot be removed, and it bonds permanently.
Editor’s Opinion
When it comes to bonding various parts and materials, the 3M 08690, 08693, and 08609 do an excellent job in their own respective fields.
So they are all the best adhesives if you apply them right.
But remember that the 3M 08509 is not an adhesive. So it will allow you to detach or remove the parts in the future.
And while the adhesives come with a 12-month shelf life, the 08509 sealant can be stored for 24 months.
So, it’s up to you to decide which adhesive or sealant goes with your requirements and expectations.