Does Plexaderm Last As Long As Peter Thomas Roth? Comparing Effectiveness and Duration

by: Linda Robison / Facial Fitness Specialist @ ABZ

✔️Key Takeaway: How Long Does Plexaderm Last Compared to Peter Thomas Roth?

  • Plexaderm results typically last 6–8 hours, with some users reporting up to 10 hours when applied correctly.
  • Peter Thomas Roth FirmX lasts 6–10 hours, with its added hydration helping it stay effective longer.
  • Plexaderm provides a stronger tightening effect but may break down faster, especially with facial movements.
  • FirmX offers a more flexible hold and tends to last longer on dry skin
  • For maximum lift, choose Plexaderm. For a natural look, FirmX is the better option.

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.

ABZ Tip: If under-eye puffiness is a regular struggle, pairing your serum with a gentle lymphatic massage can enhance results. Check out my face massage for under-eye bags guide to see how it works.

How does Plexaderm work?

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Plexaderm creates an instant tightening effect using sodium silicate, forming a temporary film that smooths out puffiness and fine lines. But since it doesn’t hydrate, results can fade within 8 hours—or even faster if you have oily skin or make frequent facial movements.

✔ Pro Tip: For better results consider layering it with a hydrating eye cream from my best eye wrinkle treatments roundup.

Why do results fade?

Plexaderm works by using sodium silicate, which creates a tight film on the skin. This film temporarily tightens and reduces puffiness but may break down over time.

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?

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Peter Thomas Roth FirmX results typically last between 6-10 hours. The flexible film-forming polymers provide a smoother finish than Plexaderm, allowing for more natural facial movement. The added hydration from hyaluronic acid helps maintain results longer, especially on dry skin.

Why do results fade?

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

ABZ Tip: Check out my puffy eye serum review page to see how it looks on my eyes and grab my tip for dealing with that whitish residue. 😉

Which eye serum lasts longer?

Plexaderm’s tightening effect works quickly, but because it forms a rigid film, it can break down faster—especially with facial movements or oily skin. If you tend to squint, smile often, or have an expressive face, you might notice the effects fading sooner.

Peter Thomas Roth FirmX, on the other hand, uses a more flexible formula with hydrating ingredients. This allows for smoother facial movement without cracking or flaking. The added hydration helps it maintain a fresher look longer, especially for those with dry or mature skin.

While both products are temporary, FirmX may hold up better throughout the day, whereas Plexaderm gives a more dramatic but shorter-lasting lift.

Which One Should You Choose?

  • Go with Plexaderm if you need a stronger tightening effect to visibly reduce deeper under-eye bags or wrinkles quickly. It’s great for special occasions but may feel firm or dry on the skin.
  • Choose Peter Thomas Roth FirmX if you want a more natural, flexible look that lasts throughout the day. The hydrating formula makes it a better choice for dry or sensitive skin, and it holds up well even with facial movement.

Both products are temporary solutions, but FirmX tends to be the better option for all-day wear, while Plexaderm delivers a stronger but shorter-lasting lift.

Application and tips for long lasting results

A woman applying eye serum to reduce puffiness and fine lines, showing effective application techniques for longer-lasting results.

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.
  • Choose an Eyeliner and concealer That Won’t Settle Into Fine Lines – The wrong eyeliner can emphasize under-eye creases, making puffiness more noticeable. If you're looking for smudge-proof options that flatter mature eyes, check out my best eyeliners tips for aging eyes.

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?

Plexaderm vs. Peter Thomas Roth Comparison
Feature Plexaderm Peter Thomas Roth
Claimed Duration Up to 10 hours Several hours (varies by use)
Application Tips Apply a small amount, let dry Apply thin layer; let dry
Finish Matte, firm Smooth, firm
Potential Drawbacks Feels tight; may flake Feels firm; may flake
Best For Extreme puffiness and wrinkles Mild puffiness, fine lines

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.

Studies 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 ).

Still not sure?

Still unsure which one is best for you? Let me know in the comments or check out my personal experience and reviews above!



FAQ: 

Question: Which is better Plexaderm or Peter Thomas Roth?

Answer:  Plexaderm and Peter Thomas Roth Instant FirmX both temporarily tighten the skin and reduce under-eye bags, but they differ in longevity, texture, and price. Plexaderm provides a longer-lasting effect but can leave a visible residue if overapplied. Peter Thomas Roth has a lighter, more flexible finish and is often the more affordable option. If you prioritize extended wear, Plexaderm is the better choice, while Peter Thomas Roth is ideal for those who want a lighter feel at a lower cost.

Question: What are some Plexaderm alternatives?

Answer: Alternatives to Plexaderm that help fix the same concerns, such as puffiness and fine lines include:

These alternatives target similar concerns but may contain different ingredients, so always check for potential allergens.

Question: Are there Plexaderm-like products for sensitive skin?

Answer: For sensitive skin, you might want to opt for products with gentler ingredients. While these alternatives don't provide an instant lift like Plexaderm type products, they focus on minimizing irritation while providing the firming and anti-aging benefits on the over the long term. 

Question: How long does Plexaderm last, and how does it compare to Peter Thomas Roth?

Answer:  Plexaderm results generally last 6–8 hours but may fade faster on oily skin or with frequent facial movements. Proper application—clean, dry skin and minimal facial movement—can help extend results up to 10 hours.

Peter Thomas Roth FirmX lasts 6–10 hours and benefits from added hydration, making it a better option for dry or sensitive skin. If longevity is a priority, FirmX may last longer on some users.

More anti-aging tips:

About the Author:
Linda Robison is a Facial Fitness Specialist and the founder of Anti-Aging Beauty Zone. She shares expert insights on skincare, facial rejuvenation, and beauty treatments—blending traditional wisdom, personal experience, and science-backed research for both at-home and in-office solutions.

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