Dynaflex 230 Vs. Alex Plus Silicone: Which Caulk To Choose?

Choosing a reliable caulk to hide gaps and cracks of internal walls or external sidings is necessary. They are also effective in sealing out moisture and protecting the building wall for a long time.

Dynaflex 230 and Alex Plus are both excellent options to consider.

However, they are ideal for using some particular purposes separately. Knowing the difference between Dynaflex 230 vs. Alex Plus can help you select the right option based on your home building project.

Here we will go for in-depth details about both caulks.

A Quick Comparison Table

Keen to have a brief idea about both caulking products? You can go through this comparison table to learn some basic details about Dynaflex 230 and Alex Plus.

SpecificationDynaflex 230Alex Plus
SuitabilityIdeal for internal and external purposesBetter suitable for internal purposes
Paintable timePaintable within 2 hoursPaintable within 30 minutes
Seal Quality100% waterproof & weatherproof sealWaterproof seal
Color optionsNine different colorsOnly white color
Sizing optionsOnly one sizing optionTwo sizing options
FlexibilityMore flexible to useLess flexible to use
ASTM SpecificationC920, Class 25.C834
CostA little bit expensiveMore affordable

Primary Differences Between Dynaflex 230 And Alex Plus

So, you got a brief idea about each caulk or sealant. Is the information enough to choose the correct option? May not! Here are in-depth details about each caulk to get a better overview of its features and usability.

  • Suitability
DYNAFLEX 230 Interior and Exterior Sealant
Click On Image To View on Amazon

Before choosing a particular sealant, you must know whether it is ideal for your intended purpose. Alex Plus is purposely designed for using internal purposes.

You can use this Acrylic Latex Caulk Plus Silicone to seal and fill cracks and gaps.

Corner joints, door and window frames, baseboards, trim, etc., are some common areas where you can apply it.

Whether it is drywall, masonry, metal, aluminum, vinyl, concrete, brick, or painted/unpainted wood, Alex Plus can incredibly adhere to various surfaces.

On the other hand, Dynaflex 230 is perfect for using both internal and external purposes. You can create an ideal sealant on doors, windows, sidings, and trim.

Moisture-prone areas such as tubs and showers are also suitable for using Dynaflex 230 since they are polyurethane adhesive.

  • Paintable Time

Compared to Dynaflex 230, Alex Plus takes less time to dry. It is necessary to wait a minimum of 4 hours to paint after applying Dynaflex 230.

In contrast, Alex Plus has a quick-drying formula, which is easily paintable within 30 minutes. This will save you time.

  • Seal Quality
Alex Plus Acrylic Latex Caulk with Silicone
Click On Image To View On Amazon

When choosing a particular sealant, it is vital to consider its sealant quality. Alex Plus can create a long-lasting seal on the applied surface.

Regular and minor moisture won’t be able to harm its quality since the product creates a waterproof seal. But they are not ideal for outside purposes.

In contrast, Dynaflex 230 creates a 100% waterproof & weatherproof seal. Apart from moisture, external weather factors will merely cause any harm to its sealant quality.

Even heavy rain won’t degrade its adhesion quality over time. This is why you can use it outside areas.

  • Color Options

Though color options may appear to be a minor issue, they can affect the final result in some cases. Alex Plus is only available in white color. This seems okay when working with bright color paints.

Contrastly, Dynaflex 230 is available in 9 colors such as white, clear, almond, black, gray, cedar tan, clay, brown, and dark bronze. So, you have more flexibility to choose your preferred color.

  • Sizing Options

Dynaflex 230 is mainly available in one standard size: 10.1 fluid ounces. This is primarily beneficial when working on medium or large projects. You don’t need small purchase items repeatedly.

On the contrary, manufacturers offer two sizing options for Alex Plus:5.5 fluid ounces and 10.1 fluid ounces. It is convenient to use small or medium-sized projects because you don’t need to spend extra money buying bulk quantities.

  • Flexibility

Both sealants have their own flexibility. But Dynaflex 230 is more flexible than Alex Plus since you can use it for internal and external purposes.

However, there are some cases for internal purposes where Alex Plus can show better results than Dynaflex 230. For example, Alex Plus is the best option if you need to paint any areas quickly after applying the caulk.

  • ASTM Specification

It is crucial to consider the safety and quality of a particular sealant before using it. ASTM testing standards are among the most reliable standards to ensure higher-quality rail products.

Alex Plus has ASTM C834 standard. It means the product has low-temperature flexibility, reduced shrinkage, proper adhesion, and other safety features.

On the other hand, Dynaflex 230 features ASTM C920 and Class 25 standards. It is one type of Elastomeric Joint Sealant, which you can use for caulking, sealing, or glazing.

  • Cost

You can’t ignore the price of a house-building product. The cost of Dynaflex 230 is slightly higher than Alex Plus.

But it is worth paying the added amount because it has better adhesion, more safety standard, and extreme durability. 

  • Warranty

Sealants are supposed to last for a long time when you apply a reliable quality caulk. Alex Plus offers 40 years warranty for their products, while Dynaflex 230 has a lifetime warranty.

Hence, Dynaflex 230 is a more reliable option when considering its warranty period. But make sure to follow the instruction manual to apply the product correctly.

Otherwise, the warranty period may become void if you use it incorrectly.

Which Choice Is Best For Your Home?

Alex Plus

Choosing a particular sealant requires you first to determine the kind of project you want to handle.

If you have decided to use it for a small or medium project and need to paint the surface within a short time, you can choose the Alex Plus option. It is affordable too.

But when you are handling a bulky project, and need extreme durability, selecting Dynaflex 230 appears the best choice. It is safer as well.

Frequently Asked Questions (FAQs)

Does DYNAFLEX 230 contain silicone?

There is no silicone added to any DYNAFLEX 230 products.

What is the best elastomeric caulk?

Though many options are available in the market, Dynaflex 230 is one of the best elastomeric caulks due to its high-quality formula. Compared to pure silicones and silicone-latex caulks, it can show reliable performance and long-lasting durability.

Is DYNAFLEX 230 mold resistant?

Yes, Dynaflex 230 is mold and mildew resistant, but you need to ensure they are properly dried and cured. Since they have a slow drying process, waiting a minimum of 2 hours will be vital.

Is DYNAFLEX 230 good for showers?

Yes, you can use DYNAFLEX 230 for showers and tubs as they are 100% waterproof and weather resistant. But better options are available than DYNAFLEX 230 since it is not specially made for showers and tubs.


Picking the right caulk or sealant requires you first to decide where you need to use it. Once you determine your intended purpose, you can easily choose between Dynaflex 230 vs. Alex Plus.

Hopefully, this article has helped you to learn some essential details about both high-quality sealants and where you can use each of them. Thanks for reading!

Ralph Wade

Hey...Ralph is here! So, did you find this article useful? If so, please leave a comment and let me know. If not, please tell me how I can improve this article. Your feedback is always appreciated. Take love :)

One thought on “Dynaflex 230 Vs. Alex Plus Silicone: Which Caulk To Choose?

  1. I appreciate your observations. I was obviously looking for an opinion on which product to choose between the two of these. It looks like either will do for my interior baseboard project.

    Thank you-

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Recent Posts