RadonSeal Reviews 2,405

TrustScore 4.5 out of 5

4.6

While we don't verify specific claims because reviewers' opinions are their own, we may label reviews as "Verified" when we can confirm a business interaction took place. Read more

To protect platform integrity, every review on our platform—verified or not—is screened by our 24/7 automated software. This technology is designed to identify and remove content that breaches our guidelines, including reviews that are not based on a genuine experience. We recognise we may not catch everything, and you can flag anything you think we may have missed. Read more

Review summary

Created with AI, based on recent reviews

Evaluating 155 reviews, reviewers overwhelmingly had a great experience with this company, frequently praising the products for their effectiveness in stopping leaks and sealing surfaces. Customers consistently highlight the excellent customer service, noting that representatives are helpful, informative, and go out of their way to assist with product selection and order processing. The ordering process is described as easy and smooth, with many appreciating the quick delivery and well-packed shipments. However, some reviewers experienced issues with product coverage not matching advertised amounts, and a few reported problems with shipping, such as delayed deliveries or incomplete orders. Additionally, a small number of people were dissatisfied with the product's appearance after drying or found certain application methods ineffective.

What people talk about most

Product

Clients share positive opinions on product quality and effectiveness, with many reviewers praising the ease... See more

Delivery service

Customers consistently report positive experiences with delivery service, frequently highlighting the speed... See more

Order

Users describe positive interactions with order, highlighting the ease and speed of the ordering process,... See more

Quality

Reviewers highlight positive aspects of quality, with many expressing satisfaction with the product's... See more

Customer service

Reviewers consistently express satisfaction with customer service, highlighting their helpfulness and... See more

Reviews shaping this summary

Rated 5 out of 5 stars

My basement had multiple cracks (no comments about my builder's skills). This product stopped leaks completely. Now I can install drywall. I bought the crack repair kit on Amazon, but I needed more co... See more

Rated 5 out of 5 stars

A reasonable and helpful company. They answered questions, and assisted finding right product. The product isn't cheap, not expensive either, but works as it should. They provide plenty of documenta... See more

Rated 5 out of 5 stars

The customer service over the phone was amazing. The gentleman I talked to walked me through all the products I had questions on for 45min. He did not try to upsale me and even talked me out of one of... See more

Company replied

Rated 5 out of 5 stars

Fantastic product and support. Especially happy with Mike, who patiently answered my questions on multiple occasions and helped me find the right product for my project. The concrete sealant for my... See more


Company details

  1. Home improvement shop
  2. Finishing materials supplier

Written by the company

It happens to thousands of homeowners each year – the sale of their home falls through because of high radon in their basement. They have to hustle to get a radon mitigation system installed and hope that the buyer will not walk away. But for many years after, they may wonder about the long-term effects of the radioactive gas on their children. Since radon gas seeps into basements from the ground, the US Environment Protection Agency had tested the obvious solutions back in the 1980's – caulking all cracks and sealing the concrete with various coatings but the improvements were not significant or lasting. Thus, the fan-based system which draws soil gases from underneath basement slabs became the standard. There had to be a better way! Novion Inc. was founded in 1987 to pursue innovative high-tech solutions. Penetrating concrete sealers, already well-proven for waterproofing concrete on major projects, seal concrete internally and permanently. Perhaps, they could be improved to penetrate deeper and seal even tighter to keep out the single-atom radon gas. After extensive research and testing, the first concrete sealer specifically developed to reduce radon infiltration through concrete was ready for the big debut – RadonSeal® Deep-Penetrating Concrete Sealer. Novion Inc. was incorporated in Connecticut and RadonSeal was made available directly to homeowners and contractors on radonseal.com website. Subsequently, we have continued to add unique innovative products, not available in stores, for basements, indoor or outdoor concrete, bricks, pavers, and masonry. Going beyond radon remediation, we provide durable and cost-effective solutions for waterproofing basements, sealing concrete slabs against vapor, and mold remediation. Our products also protect and beautify indoor or outdoor concrete, pavers, and masonry. Our mission is to supply cutting-edge, professional-grade, and environment-friendly products, superior to those sold in stores. Our customer support offers technical expertise and objective guidance on the best solutions for customers' needs. Whether you are a homeowner, contractor, or building owner, we will provide the top-quality products and service to solve or prevent problems with your basement, parking lot, pool deck, brick or masonry walls. It can be just a matter of time before your basement or outdoor concrete starts giving you problems. Act now and give us a call. We are here to help!

Written by the company


Contact info

4.6

Excellent

TrustScore 4.5 out of 5

2k reviews

5-star
4-star
3-star
2-star
1-star

Asks customers to review

This company invites their customers to review, whether positive or negative

Replied to 36% of negative reviews

Typically replies within 24 hours

How this company uses Trustpilot

See how their reviews and ratings are sourced, scored, and moderated.

Companies on Trustpilot aren't allowed to offer incentives or pay to hide reviews. Reviews are the opinions of individual users and not of Trustpilot. Read more

Rated 5 out of 5 stars

Great value, excellent website navigation.

Great value. Website was excellent. Informative, thorough, good color representations, etc. I ordered concrete stain and sealer in one. Very easy to order. Efficient process. Order arrived timely and intact (well packaged). Will order again if I need more stain/sealer.

31 July 2025
Rated 1 out of 5 stars
RadonSeal logo

Reply from RadonSeal

Hello Peter. Your item is on its way. UPS indicates there was a slight delay due to "operating conditions" but they show the delivery day as today. Sorry for any inconvenience.

The Trustpilot Experience

Anyone can write a Trustpilot review. People who write reviews have ownership to edit or delete them at any time, and they’ll be displayed as long as an account is active.

Companies can ask for reviews via automatic invitations. Labeled Verified, they’re about genuine experiences.

Learn more about other kinds of reviews.

We use dedicated people and clever technology to safeguard our platform. Find out how we combat fake reviews.

Learn about Trustpilot’s review process.

Here are 8 tips for writing great reviews.

Verification can help ensure real people are writing the reviews you read on Trustpilot.

Offering incentives for reviews or asking for them selectively can bias the TrustScore, which goes against our guidelines.

Take a closer look