Straight answers on what ConvaTec is, how to use Stomahesive paste correctly, why it stings sometimes, and how medical device quality standards have changed over the years.

I've spent the last four years working in quality for a medical device company—roughly 200 unique product reviews a year, from wound dressings to skin barriers. In 2024, I rejected about 4% of first submissions for spec deviations: viscosity drift, packaging seal failures, label mismatches. Nothing catastrophic. But the kind of thing that matters when a product sits against someone's skin for days.

In my experience, the products we call "simple" are often the ones where small mistakes cause the biggest problems. Stomahesive paste is a perfect example. It's a small tube with a big job—and honestly, most of what comes across my desk isn't about the paste itself. It's about how it's applied.

These are the questions I get most often, from new ostomates, caregivers, and procurement people trying to make sense of the product range:

• What does ConvaTec actually do?
• How do you use Stomahesive paste correctly?
• Why does the paste sting sometimes?
• Can you use it on broken skin?
• How much paste is too much?
• Has ostomy care actually changed over the years?
• How do you know the product you bought is within spec?

1. What exactly is ConvaTec—and is ConvaTec Ltd a different company?

ConvaTec is a medical device company focused on four main areas: wound care, ostomy care, continence care, and infusion care. You've probably seen the brand on skin barriers, pastes, catheters, or wound dressings. ConvaTec Ltd is essentially the same enterprise—it's the legal entity name you'll see on packaging and in certain market registrations. Depending on the document, you might also see ConvaTec Group or ConvaTec Inc. Same company, different corporate shells for different regions.

The portfolio is broader than most people assume. It's not just ostomy supplies. The company also makes advanced wound dressings, moldable skin barriers, continence products, and infusion-related devices. For a full product breakdown, the official ConvaTec website is more useful than any summary I could give here.

2. How do I use ConvaTec Stomahesive paste?

Here's the short version:

1. Clean the skin around the stoma with plain water. Avoid oily or moisturizing soaps—residue interferes with adhesion. Let the skin dry completely.
2. Squeeze a thin, continuous bead of paste around the stoma base, or apply it to the back of the barrier plate around the opening.
3. Press the barrier into place and hold it with gentle hand pressure for 30 to 60 seconds. Body heat helps the paste soften and mold.
4. When removing the pouch, use adhesive remover wipes, then let the skin air-dry before applying fresh paste.

From the quality side, I'd add this: the paste is meant to fill the gap between the stoma and the barrier opening—it's a filler, not a glue. Apply it only to the skin around the stoma, not directly on the stoma tissue itself. And don't be tempted to slather it on. The material swells as it absorbs moisture; that swelling is exactly what creates the seal.

3. Why is the paste so sticky—and why does it sting sometimes?

That stickiness is by design. Stomahesive paste uses a moisture-absorbing adhesive system that stays tacky enough to hold the barrier in place against movement, perspiration, and normal wear. What most people don't realize is that the stickiness and the swelling behavior are connected. It's not just glue—it's an active seal that adapts as it hydrates.

As for stinging: some paste formulas contain a small amount of alcohol, which can cause a brief sting if the skin is already red or broken. It's usually short-lived. But if you're dealing with raw skin, flag it with your WOC nurse—there are alternative formulas and barrier products that may be gentler on damaged skin.

4. Can I use Stomahesive paste on broken or irritated skin?

Short answer: it's not the right tool for that job.

Paste is designed to fill gaps and create a seal on intact skin. If the skin around the stoma is red, weepy, or broken, the priority is figuring out why. The usual culprits are:

• Leakage—output getting under the barrier and sitting on the skin.
• A fungal infection, especially if the redness comes with small satellite bumps.
• Contact irritation from adhesive residue that wasn't fully removed.

In our quality validation, we test products on healthy, intact skin. When skin is compromised, the risk profile changes completely. That's why I'd push anyone—patient or clinician—to treat the skin issue first, ideally with guidance from an ostomy nurse, rather than just adding more product on top.

5. How much paste should I actually use?

Less than you think.

The mistake I see most often is people applying a thick layer—sometimes a full spiral—because they assume more paste equals a stronger seal. It doesn't. A thick layer can lift the barrier, create channels for output, and actually increase the risk of leakage. A thin bead is usually enough to fill the micro-gaps around the stoma base. If you're dealing with a deep crease or irregular surface, consider a barrier strip or seal ring instead.

Everyone warned me about this early in my career: "Tell patients to use a thin bead." I didn't fully believe it until we ran a comparison test with different application amounts. The thick application had a noticeably higher leak rate after 6 hours. That test changed how we wrote our patient instructions.

Start small. You can always add a little more.

6. Has ostomy care really changed over the years?

Depends on what you mean.

The fundamentals haven't changed: clean, dry, protect, seal. But the execution has transformed. What was best practice a decade ago—using harsh soaps that leave residue, or applying powder under the barrier—has been corrected as materials improved. Today there are moldable barriers that don't need cutting, extended-wear adhesives, and better guidance about when to use paste vs rings vs seals. What was best practice in 2020 might not be the first choice in 2025.

This evolution isn't unique to ostomy care. The broader medical device field is moving the same way. Dental x-ray machines went from film to digital with dramatically lower radiation doses. Cryosurgery devices have moved into more targeted procedures than the broad applications common 15 years ago. And people ask how anesthesia works—essentially, it interrupts nerve signals so the brain doesn't register pain—but the equipment that delivers it has to be consistent to a fraction of a percent, because there's almost no margin for error.

What does that have to do with a tube of stomahesive paste? More than you'd think. The same quality discipline that governs those high-tech devices—design controls, batch traceability, stability testing, documented verification—applies to the "low-tech" products too. Different complexity, same mindset.

7. How do I know the product I bought is actually within spec?

That's exactly the question I deal with daily.

Here's something vendors won't always tell you: a product can look fine in the tube and still be out of spec. That's why quality systems exist. Medical device manufacturers selling in the US are generally required to follow the FDA's Quality System Regulation (21 CFR Part 820) or ISO 13485. That means batch records, release testing, stability studies, and complaint investigations follow every lot.

In 2024, we held a batch of paste because the viscosity was slightly off-spec. It looked fine, it smelled fine, but the tack profile didn't match our reference standard. The vendor argued it was within "industry tolerance." We rejected it anyway, and the replacement run cost them more than the original order. Even after the decision, I kept second-guessing—what if their data was right and I was being overly strict? I didn't fully relax until the replacement batch passed every test we ran.

That's not bureaucracy. That's the system working. Most patients will never see those records, but every batch you use is traceable to a release decision made by someone like me.

To be fair, a lot of ostomy care comes down to individual anatomy. What works for one person won't necessarily work for another, and no article can replace the guidance of a wound care nurse. But the basic rules—use a thin bead, press and hold, and remember that paste is a filler, not a fixer—are the same ones I'd give to a family member. If in doubt, start smaller.