Marshalltown M68SSD stainless steel corner trowel (rounded) for outside corners

If you do a fair bit of plastering or rendering, corner work is the bit that can make (or ruin) the finish. This Marshalltown M/T68SSD M68SSD is a corner trowel made to help you form outside corners with a rounded radius, and it’s built with stainless steel for strength and rust resilience.

It’s not trying to be a multi-purpose “jack of all trades”. Instead, it leans into one job really well: shaping corners consistently, including the sort of details you hit around steps. And if you’re the sort of person who cares about fatigue after a long session, the DuraSoft handle is designed to give a softer feel and help reduce strain.

The essentials

This tool is a rounded corner trowel aimed at forming outside corners (and inside corners as well, per its intended use). The rounded profile is the whole point: it helps you create that smooth, even radius instead of a sharper edge that can catch, chip, or look uneven.

Because it’s manufactured from stainless steel, you’re buying into a materials choice that’s meant to stand up to the day-to-day reality of construction work—specifically strength and resistance to rust. The handle is mounted in the centre of the trowel, which is a thoughtful balance decision: it should make the tool easier to control when you’re working along an edge for longer stretches.

What you’ll notice in use

On paper, corner trowels live or die by control and comfort. Here, Marshalltown’s design leans on a central handle mount for balance and a DuraSoft handle for a softer feel.

In practical terms, imagine you’re working around the outside edge of a small step. You load the tool, run it along the corner to shape the radius, then lightly refine the line so the edge looks even from top to bottom. That “refine and smooth” stage is where a dedicated rounded corner tool tends to make your life easier compared with trying to improvise with a flat blade.

Worth noting: the rounded radius is great when you actually want a rounded look. If your project calls for a different corner profile, this won’t magically match it.

Key features that matter

• Stainless steel construction aimed at strength and rust resilience, so it’s better suited to tools that get exposed to moisture and site conditions.
• A rounded corner profile for forming outside corners with a consistent radius.
• Centre-mounted handle to support balance and ease of use during shaping.
• DuraSoft handle intended to provide a soft feel, reduce fatigue, and offer durability.
• Manufactured in the USA using top quality materials and equipment, which is part of the brand’s positioning.

Limits and who should think twice

This corner trowel is a specialist. That can be a positive, but it also means it may not be the best choice if you want one tool that does everything from scratch.

Also, because the information provided focuses on rounded outside corners and corner forming, it’s sensible to double-check that the radius and rounded profile you’re after matches what your surface needs. If your job is more about straight edges or sharp profiles, you may end up fighting the tool instead of getting the finish you want.

How to choose if you’re comparing options

When you’re weighing this against more general trowels, think about the job you actually do most. If you regularly shape corners, especially rounded outside corners or areas like steps where the radius matters, a dedicated corner trowel often saves time and improves consistency.

If you only do corner work occasionally, a dedicated tool might feel like overkill—though the comfort and rust-resilient build could still be appealing if you want something that lasts.

Care and handling tips (so it stays usable)

With stainless steel, you’re already starting from a more resilient material choice. Still, it helps to keep it clean after use so the blade and corner profile aren’t left with dried residue that makes shaping harder next time. The handle is described as DuraSoft, so you’ll generally want to avoid aggressive treatments that could degrade the soft feel over time.

Buying verdict

This Marshalltown M68SSD stainless steel rounded corner trowel makes sense if you need to form outside corners with a radius and want a tool designed around comfort and control. The centre-mounted handle and DuraSoft grip are the sort of details you appreciate on longer jobs, and the stainless steel build is a practical nod to rust resilience.

It might not be the best pick if your projects require a different corner profile (not rounded) or if you’re after an all-in-one trowel for general wall finishing. In that case, you may be better served by a more general tool and bring in a specialised corner implement only when the job really demands it.

Mini FAQ

What is this trowel mainly for?

It’s intended for forming inside and outside corners, with a rounded radius profile—also useful for steps or any location where a rounded corner is required.

Is it suitable for wet or site conditions?

It’s made from stainless steel, which is described as strong and rust resilient, so it’s aimed at handling typical construction conditions.

Does the handle design actually help?

The handle is mounted in the centre for balance and uses a DuraSoft grip intended to reduce fatigue and provide a soft feel—both are aimed at easier, more comfortable use.

Is it a good choice if I only do occasional corner work?

It can still be worth considering for longevity and comfort, but if corner work is rare, you may prefer a more general trowel until you know you’ll use it often.

Will it work for sharp, non-rounded corners?

This model is designed for rounded corners. If your finish requires a sharper profile, it may not match what you need.