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frequently asked questions

Is sealing the manhole ring really necessary?

This is the first area to be compromised during the life-cycle of a manhole. The deterioration of this area can be easily prevented by using a seal such as CLADSEAL. Read MANHOLE CHIMNEY SEALS: DO WE REALLY NEED THEM? to learn more.


What are some advantages of using CLADSEAL rather than other systems?

CLADSEAL is applied inside the manhole structure, so there’s no need for costly excavation or pavement replacement. Because it is hand applied, the dimensions or shape of the manhole are not critical to success. CLADSEAL was developed without free isocyanides, so it is safe during application. The product was developed to be moisture insensitive, unlike other elastomers with similar applications. Given the environment in which it is being applied, this is essential. CLADSEAL was also developed with shelf life in mind. The 2-year shelf life is unparalleled in the industry.

Can this product handle vibration from traffic?

Yes, this elastomeric has properties to withstand vibration and movement. Where most epoxies and cements would crack, CLADSEAL can handle this movement.

What is the advantage of sealing the ring rather than using a riser ring?

Using CLADSEAL is a quick and simple method of sealing the adjustment ring area, which is often the first area of a manhole to be compromised. Because CLADSEAL is applied by hand, it can be used in any manhole structure, regardless of shape, size or dimension, which is not the case with manhole sealing rings.

Does the surface need to be completely dry before applying CLADSEAL?

There should not be any surface wetness during application. Moisture saturation in the concrete is inevitable and can be present during the CLADSEAL application.

Can you use epoxies or concrete for the chimney seal area of the manhole?

Epoxies or cementitious products are not recommended because they can crack, due to the micro-vibration and/or movement that typically occur in this area.

Does CLADSEAL require a primer?

Yes, CLADSEAL primer should be applied before CLADSEAL. One gallon of CLADSEAL Primer can cover between five and ten manholes.

Is there any equipment required to use this product?

The only equipment needed is a mixing drill, and spatulas or a trowel. The product can be mixed right in the container it comes in.

What kind of surface preparation is required?

The surface must be clean, in sound condition, Remove all oil, dust, grease, dirt, loose rust, and other foreign material to ensure adequate adhesion. The minimum recommended surface preparation is:
Concrete & Masonry: SSPC-SP13/NACE 6
Metal rings: SSPC-SP6 / NACE 3 Commercial Blast Cleaning
Ensure surface is completely dry before priming

How large of an area of the ring should be covered with CLADSEAL?

CLADSEAL should be applied onto the prepared ring, starting just below the lip that the cover sits on and worked down at least 12-18” onto the masonry section. Each kit is specially packaged to allow for use in a single manhole application.

What is the cure time?

Dry to the touch within minutes. CLADSEAL is moisture insensitive during the curing process so the manhole can be returned to service immediately after application.

Can it be applied using a spray gun?

CLADSEAL has to be applied by trowel or a spatula for best results. It cannot be sprayed.

Can CLADSEAL be used in other areas of the manhole?

Yes, it can be used on any joints within the manhole structure.

CLADSEAL is an elastomeric urethane; is there a safety concern due to isocyanates?

No: although CLADSEAL is a urethane, it does not have common urethane characteristics. CLADSEAL does not contain any isocyanate.

What is the shelf life of CLADSEAL?

Two years, which is significantly longer than the typical chimney sealer.