Stop rust with NHOU undercoating

NHOU (NH Oil Undercoating®) is an oil-based rust protection system from a family-owned New Hampshire company that has specialized in rustproofing since 2010. Its refined mineral oil formula creeps into seams and cavities, penetrates existing rust, displaces moisture and seals out oxygen. Atlantic Protective Coatings is an independently owned NHOU distributor serving the Greater Charleston area.

Rubberized, tar and paint-style undercoatings dry into a hard shell. Over time that shell chips and cracks, and moisture gets trapped behind it — so rust keeps spreading where you can't see it. NHOU stays soft: it creeps into seams, pushes moisture out and flows back over nicks and abrasions instead of cracking.

Coastal life is tough on metal. Salt carried in off the Atlantic settles on your undercarriage every day, the Lowcountry's humidity keeps everything damp for long stretches, and storm spray and brackish floodwater push salt into every seam. Vehicles here simply rust faster than they would inland — and undercoating is the most direct way to level the field.

Usually not. NHOU Oil Undercoating is engineered for any level of rust, from brand new to heavily corroded — it penetrates existing rust down to the base metal and cuts off the moisture and oxygen rust needs to spread. Heavy mud and flaky rust should come off first; we'll clean it up, or sand blast where it runs deep. The sooner you start, the more metal there is to save.

If you plan to keep it, yes — rust can start in factory welds and seams before the first mile. For newer vehicles with little to no rust, NHOU® HYBRID cures to a drip-free, matte-black finish and is backed by NHOU's lifetime, transferable warranty when applied by an authorized applicator. NHOU Oil Undercoating is a smart choice at any age.

NHOU recommends an annual Oil Undercoating application for consistent protection — affordable yearly insurance for your undercarriage. HYBRID is semi-permanent. We'll suggest a schedule based on how and where you drive.

Most NHOU applications take about an hour, and you can drive away right after. Vehicles that need blasting or extra prep take longer — we'll give you an accurate time window when you book.

NHOU Oil Undercoating is formulated to be low-drip; after a heavy application a few drops may fall, and they clean up easily with dish soap. On your first drive you may notice a little smoke or odor as overspray burns off the exhaust, or a slight grinding sound for the first few stops from overspray on the brakes. Both are harmless and go away quickly.

Mouse-Out is NHOU's rodent repellent, infused into the clear formula that goes inside the frame, into body cavities and onto the wiring under the hood. It repels rodents four ways — scent, taste, touch and predatory fear, using peppermint oil and a predator scent people can't smell — and was rated 92% effective at repelling mice in third-party lab testing. That matters because many modern wiring harnesses use soy-based insulation that attracts rodents.

Yes on both counts. NHOU is a highly refined, food-grade mineral oil — solvent-free, nonhazardous and non-conductive, so it won't harm electrical connections, rubber, plastic or paint. And under the federal Magnuson-Moss Warranty Act, a manufacturer can't void your warranty just because you used an aftermarket product like NHOU; they'd have to prove it caused the problem.

Sand blasting uses pressurized abrasive media to strip rust, scale and failed coatings off metal. We use it for restorations, parts and project vehicles that need to come back to clean metal, and as heavy-duty prep when loose scale is too thick to scrape.

Call us at (843) 555-0123 or use the quote form on this page. Tell us the year, make and model and what you're looking for — cars, trucks, fleets, trailers or golf carts — and we'll get back to you promptly with clear pricing. No obligation.