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Terms & Conditions

Information Disclaimer

In order to provide helpful information, this website presents information and advice based on our own knowledge, experience, and opinions, as well as other sources we consider credible. It is not intended to be a substitute for professional medical, technical, or other expert advice. We expressly disclaim liability for such information or advice and the reader is encouraged to also consider other sources.

Damages Disclaimer

Our products are applied by others and to a wide variety of materials under different applications and conditions. We do not provide any warranties, expressed or implied, except for the performance guarantees specifically stated about the product(s). The purchaser shall determine the suitability of the products for the intended application and assumes all risks and liabilities whatsoever arising in connection with their use. Novion Inc. is, therefore, not liable for any injury, loss, and direct, indirect, or consequential damages arising out of the use of our products. In any case, our liability shall not exceed the cost of the products paid by the purchaser, excluding shipping costs and taxes.

We highly recommend you contact us before making a purchase. Samples sizes are and can be made available for some products so you may carry out your own test to confirm the suitability of our products.

RadonSeal Concrete Sealer Limited Lifetime Money-Back Guarantee

RadonSeal Concrete Sealers are not topical sealants. RadonSeal seals the matrix of clean and sound concrete against capillary water seepage, water vapor and radon gas provided it is applied in accordance with the Application Instructions. We provide the following performance guarantees on do-it-yourself application by homeowners to concrete in their basement or slab-on-grade homes.

Testing is recommended to ensure proper surface suitability.

RadonSeal Waterproofing Guarantee

RadonSeal Concrete Sealers seals the matrix of poured concrete and heavyweight concrete blocks against wicking water, positive as well as negative side water pressure. If the concrete has repeatedly seeped water, you must phone us first for expert consultation! The concrete must not be leached out or internally silted up due to years of extensive water seepage resulting in heavy amounts of efflorescence. RadonSeal does not seal concrete with low cement content like lightweight CMUs, popcorn or split face blocks. Please review How To Seal Concrete Blocks.

POURED CONCRETE – RadonSeal Standard & Plus

The concrete must be at least 28 days old, bare, dry, and at least 4 inches in thickness. NOTE: For concrete less than two years old, curing agents used during the time of the pour may impede penetration of RadonSeal.


RadonSeal Plus seals bare, sufficiently dry, unsealed, unpainted heavyweight-concrete blocks. For blocks showing heavy amounts of efflorescence and dampness, please phone us first for a consultation.

*CINDER BLOCKS – RadonSeal Plus + Ion-Bond Armor

While RadonSeal Plus successfully seals most block foundations and walls, there is a possibility it may not suffice for waterproofing cinder blocks. Why? Since RadonSeal works by reacting with portland cement it simply cannot be guaranteed to seal all cinder blocks (cinder blocks contain fly ash, less cement). About Cinder Blocks.

Using RadonSeal Plus with Ion-Bond Armor to seal cinder blocks has proved foolproof for many a homeowner and contractor. Ion-Bond Armor is often applied to concrete first sealed with RadonSeal to provide the tightest possible seal against water vapor. The combination of the two is needed for sealing more porous blocks or cinder blocks in basements. Extensively leached-out and older cinder blocks (+20 years) may require additional steps to properly fill and seal the enlarged pores. Please review detailed information about Waterproofing Cinder Blocks and Hard to Seal Porous CMU’s.


Water seeks the path of least resistance. RadonSeal Concrete Sealers are not guaranteed to seal water leaks through cracks, gaps, fissures, seams, mortar separations, saw cuts, corners, or floor-to-wall joints. Further repair may be required. Please review our Crack & Joint Repair Guide and Fixing a Wet Basement for detailed information.

Radon Reduction Guarantee

If your radon level exceeds 15 pCi/L after performing a long-term test (90-day minimum), you must phone us first for a consultation. RadonSeal Concrete Sealers must be applied to all basement walls and floor, or to the entire slab-on-grade foundation slab. RadonSeal will aid to reduce and/or keep the indoor radon level below the EPA Action Limit of 4 pCi/L.

The guarantee does not apply to basements with stone foundations, protruding rocks, dirt floors, rat slabs (less than 3″ of concrete), attached crawlspace, or radon carried in by water from a private well.


Radon gas seeks the path of least resistance. Using RadonSeal alone may not suffice to reduce radon levels. RadonSeal Concrete Sealers will not seal gaps, cracks, joints, protrusions, separations, and openings in the basement walls or slabs. Additional repairs may be required to further reduce radon levels.


Allow RadonSeal cure for at least 45 days before retesting.


The lifetime of the concrete.


If you are not satisfied with the results, you must phone us first for consultation and email requested photographs of the basement slab and walls. In case you subsequently decide to hire a professional contractor to install a de-watering/waterproofing system or a fan-based mitigation system, mail us a copy of the
tests and paid contract for a FULL REFUND of the price paid for RadonSeal (excluding shipping) but not exceeding the cost of the contract.

This guarantee is valid for product purchased directly from us after March 18, 2010.

LastiSeal® Brick & Concrete Sealer Guarantee

LastiSeal Brick Concrete Sealer protects brick and sound concrete against water incursion into the substrate. LastiSeal is not a topical sealant. LastiSeal seals the matrix of brick and concrete. LastiSeal waterproofs above-grade structures against positive-side water intrusion.

Waterproofing Guarantee

LastiSeal Brick & Concrete Sealer will retain the waterproofing effect for a period of fifteen (15) years from the date of application. In the event the treated concrete loses the waterproofing effect during the limited warranty period, Novion Inc. will provide sufficient materials to restore the waterproofing effect to the areas on which it was lost.

This guarantee does not include or cover any loss of waterproofing effect due to improper surface preparation, improper application, the improper use of LastiSeal, structural defects or movement, water penetration caused by separations or cracks, holes, or joint areas requiring caulking, sealants or re-pointing, failure of the building, any damage to the building or contents thereof or any leakage due to mechanical damage or abuse.


Exclusions and Limitations

LastiSeal is not guaranteed to seal cracks, gaps, seams, corners, joints, saw cuts, separations, and holes where water can easily leak between. Further repair may be required. Please review our Crack & Joint Repair Guide.

Although frequently used for the following listed substrates, the waterproofing guarantee excludes surfaces under constant water-pressure such as; ponds, pools, seawalls, showers, basements, and subterranean construction. Due to inconsistencies and variables in construction, the waterproofing guarantee excludes rooftops, decks, slabs over occupied spaces.

Commercial Warranty

Please contact RadonSeal for our detailed commercial-warranty.