How Long Does Plexaderm Last vs Peter Thomas Roth: A Quick Comparison

by: Linda Robison / Facial Fitness Specialist @ ABZ

Wondering which under-eye serum lasts longer—Plexaderm or Peter Thomas Roth? Me too! So let’s break it down.

Both Plexaderm Rapid Reduction Serum and Peter Thomas Roth FirmX are top under-eye serums used for reducing puffiness and wrinkles. But how long do their effects last?

Here at ABZ we’ll break it to see which delivers the best all-day results.

How does Plexaderm work?

Plexaderm works by using sodium silicate, which creates a tight film on the skin. This quickly reduces puffiness and smooths fine lines.

Pros:

• Fast results 
• Easy application
• Discreet, clear formula

Cons:

• Effects fade after a few hours (around 6-8 hours)
• May leave residue if over-applied

How does Peter Thomas Roth work?

Peter Thomas Roth uses film-forming polymers, peptides, and hyaluronic acid. It tightens and reduces under-eye puffiness within minutes.

Pros:

• Hydrates while tightening
• Smooth finish
• Dries quickly

Cons:

• Results are temporary
• May require reapplication
• Requires proper application to avoid residue

Does Plexaderm last as long as Peter Thomas Roth?

When it comes to under-eye serums, the longevity of results often depends on the active ingredients and how they perform over time.

Here’s a closer look at how Plexaderm and Peter Thomas Roth measure up in terms of effectiveness and duration:

Plexaderm Rapid Reduction Eye Serum

• How It Works: Relies on silicate minerals to create a temporary tightening effect by forming a rigid film on the skin. This reduces puffiness and smooths fine lines almost instantly.
• Duration: While Plexaderm claims up to 10 hours of results, real-world effects usually last around 6–8 hours. The tightening film can lose its hold with facial movements and lacks hydrating properties, which may cause results to diminish throughout the day.

Peter Thomas Roth FirmX

• How It Works: Combines film-forming polymers with peptides and hyaluronic acid to tighten skin and hydrate. The flexible film is designed to be breathable and less prone to flaking, offering a smoother finish.
• Duration: Although the brand doesn’t specify how long results last, user feedback suggests its effects are comparable to Plexaderm, typically lasting several hours. However, the added hydration may help maintain a smoother appearance for longer periods.

Which Lasts Longer?

Plexaderm’s silicate-based formula delivers fast tightening but may falter due to its rigid nature and lack of hydration.

Peter Thomas Roth’s polymer-based formula, enriched with moisturizing ingredients, offers a more flexible and potentially longer-lasting solution for under-eye puffiness and fine lines.

Application tips for long lasting results

The general application for Plexaderm vs. Peter Thomas Roth for daily use is pretty similar. They require that the gel be applied onto clean, dry skin. And they both suggest using the smallest amount possible to start. 

Here is the best way to apply under-eye serums for long lasting wear:

• Plexaderm Rapid Eye Reduction: Using your fingertip, apply a small amount of the product directly to the under-eye area or any other areas with puffiness or fine lines. Gently pat the product in until it absorbs fully. Be careful not to over-apply, as a little goes a long way. For optimal results, Keep your face expressionless for 10 minutes while the product dries.
• Peter Thomas Roth FirmX: Apply a very thin layer of the product around the eye area, focusing on areas with puffiness, fine lines, or wrinkles. Use your fingertip to gently tap the product into the skin until fully absorbed. Let it dry completely for best results. Avoid using too much product, as it can feel heavy on the skin.

Both Plexaderm and Peter Thomas Roth require careful application to get the best, longest-lasting results.

Here’s how to apply them for optimal effectiveness:

1. Start with clean dry skin. This is key for best results!
2. Apply a small amount directly to the under-eye area using your fingertip.
3. Gently pat or tap the product in—don’t rub—until fully absorbed.
4. Keep your face expressionless for about 5-10 minutes while the product dries to avoid disrupting the tightening effect.
5. Avoid over-applying, as a little goes a long way.

General Tips:

• Skin Type: Oily skin can cause the product to break down faster, while dry skin may enhance longevity.
• Amount: Apply only a small amount to avoid a cakey finish.
• Touching or Rubbing: Try not to touch or rub your eyes after application, as this can cause the product to wear off more quickly.

Factors affecting duration

Factors That Impact Longevity:

• Skin Type: Cause quicker breakdown, while dry skin increases longevity.
• Amount Applied: Using the right amount prevents a cakey finish and boosts staying power
• Environment: Humidity and sweat can shorten the product’s duration.
• Touching or Rubbing: Can cause it to wear off faster.
• Oily Products: Heavy moisturizers, sunscreens, or makeup can reduce adherence.
• Application Technique: Gently patting and allowing the product to dry.
• Reapplication: Some products may need touch-ups during the day for continued effectiveness.

Studies: What research says about key ingredients

Sodium silicate offers a quick tightening effect but may not last long due to its rigidity, while film-forming polymers create a flexible, breathable layer that lasts longer and helps with moisture retention.

Overall, film-forming polymers tend to maintain their effects longer than sodium silicate (Cosmetics and Toiletries, 2024 ; Prequel, 2024 ).

My experience & reviews:

In my personal trials, both products temporarily reduced puffiness and smoothed fine lines, but I found Plexaderm a bit drying on my sensitive skin, while Peter Thomas Roth FirmX provided a smoother, softer finish.

User feedback generally supports these observations:

Some report that Plexaderm’s formula feels drying and can flake with facial movements, while Peter Thomas Roth FirmX is often praised for its flexibility, smoother feel, and longer-lasting effects.

Which eye gel/serum should you try?

Since there aren’t direct comparisons between how long Plexaderm lasts compared to Peter Thomas Roth FirmX, finding the best under-eye serum for your needs will come down to personal preference and a bit of trial and error.

Here’s a helpful guide to choose the right one for you:

• Heavy under-eye bags or deep wrinkles: Plexaderm works well with its strong tightening effect, making it ideal for more noticeable puffiness and deeper fine lines.
• Mild puffiness, fine lines, or sensitive skin: Peter Thomas Roth FirmX is a better option for those with lighter puffiness. Its formula hydrates and smooths, making it a great choice for delicate under-eye areas.

Ultimately, the right serum for you depends on your skin type and what works best for your unique needs.

Final takeaway: How long does Plexaderm last vs Peter Thomas Roth?

Plexaderm Rapid Reduction Eye Serum gives a fast, noticeable tightening effect, ideal for heavier bags or deep wrinkles, but its results typically last 6–8 hours and may fade with facial movements. It’s best for quick fixes but may need touch-ups.

Peter Thomas Roth FirmX offers hydration and flexibility, making it last a bit longer. It’s great for lighter puffiness, fine lines, or sensitive skin, but doesn’t have the same dramatic effect as Plexaderm.

For deeper bags or wrinkles, go with Plexaderm. For milder puffiness or sensitive skin, Peter Thomas Roth is the better choice.

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