Contact JH Sealants - Kent's Mastic and Sealant Experts
We love to hear from customers, old and new! For professional advice, or to request a quotation, please use the contact form, or if you would prefer to contact us directly, use the contact details below. We look forward to hearing from you!
Areas We Cover:
Kent including Dover, Deal, Folkestone, Ashford, Canterbury, Ramsgate, Margate, Herne Bay, Whitstable, Maidstone, Sittingbourne, Tunbridge Wells, Sevenoaks and all surrounding areas.
London and surrounding areas.
Contact JH Sealants Directly
- NVQ Level 2 qualified
- Fully insured
- 5.0 on Google Reviews
- 17+ years' experience
- Free, no-obligation quotes
Request A Quote by Form Below
Send us a few details – a photo of the job is ideal and helps us quote faster.
We’ll get back to you promptly, usually the same day, with advice or a no-obligation quotation.
Frequently Asked Questions (FAQs)
Mastic is a flexible, waterproof sealant used to fill joints, gaps, and seams in bathrooms, kitchens, windows, and construction areas.
It prevents water, air, and drafts from entering and protects surfaces from damage
High‑quality silicone applied professionally can last 5–20 years, depending on ventilation, cleaning habits, and the type of product used.
You should replace sealant when you notice cracking, peeling, gaps, mould, or leaks. These are signs the joint has failed and needs fresh silicone.
No. Sealants vary by modulus, flexibility, and intended use:
High‑modulus: Interior joints (e.g., bathrooms), contains anti‑fungicides.
Low‑modulus: Exterior joints (e.g., windows, expansion joints), allows more movement.
Yes. As well as standard white and clear, we can supply and apply a wide range of colours including R.A.L. colour-matched sealants to suit your tiling, flooring or worktops. If you’re not sure, we’re happy to advise on the best match.
This takes around 1/2 hours for a full cut out and reseal on average depending on severity of works to be carried out
Normally sealant dries at the rate of 1mm per 2 hours as it is an air cure product.
Therefore, it is normally 24 hours before completed areas can be used.
Yes. Alongside domestic work we take on contract and commercial projects for main contractors, developers, landlords and letting agents – from single fit-outs to site-wide sealant packages. See our Commercial & Contract page or get in touch to discuss.
We have a few different factors of pricing.
We can carry out a day rate, part day or minimum visit plus materials.
We can also supply a fixed priced for works or a linear meterage charge for larger scale projects.