Family owned since 2020 · Port Huron, MI
Undercoating in Port Huron, MIMichigan eats trucks. Yours doesn't have to be one.
FLUID FILM® undercoating and rust proofing in Port Huron for cars and trucks, sprayed where the salt sits: the frame, rockers and cavities. Prices by vehicle size are below. Tell us the vehicle and we'll confirm your price, usually the same day.
Seven days a week, by appointment. Can't stay? There's a key drop box.
- most vehicles, start to finish
- ~1 hrmost vehicles, start to finish
- creeps into seams, never cracks
- FLUID FILM®creeps into seams, never cracks
- by appointment · key drop box
- 7 days · 9 AM – 10 PMby appointment · key drop box
What we do
Straight prices, by vehicle size
Tell us the vehicle and what shape it's in, and we'll confirm your price, usually the same day. Commercial work and trailers are quoted per unit.
Prices · pay at the shop
Full underbody rust protection
What the job coversFLUID FILM® into the frame rails, rockers, cavities, behind the taillights and the bed panels — the whole underside, not just what shows. Priced by vehicle size.
- Small vehicle$350Cars, hatchbacks, compact SUVs.
- Mid-size / full-size$400Pickups, full-size SUVs, vans, mid-size crossovers.
from $350Get a quote →Annual touch-up
The yearly pass for a vehicle we have already protected — renewed every autumn before the salt goes down.
$200Get a quote →Descaling
Why it works over rustHeavy scale and flaking rust knocked off the frame before the film goes on. Billed by the hour.
$150 per hourGet a quote →Wash, degrease & frame flush
The underside washed, degreased and the frame flushed out — on its own, or before a full protection job on a dirty vehicle.
$150Get a quote →
Quoted per unit · contact us
Commercial & fleet vehicles
Fleets · work trucksWork vans, pickups, service bodies, plow trucks. Quoted per unit; five or more get the fleet deal.
Fleet deal: five-vehicle minimum, the sixth vehicle is free.
Contact usGet a quote →Trailer, RV or equipment
Trailers & farm equipmentFrames, tongues and axles. Trailers and implements rust from the inside of the rails out. Quoted by the job.
Contact usGet a quote →
Tell us the vehicle and what shape it's in, or call (810) 357-3023.
The product
Why FLUID FILM® and not paint
It never fully hardens
A hard coating cracks, water gets under it, and the rust is sealed in. FLUID FILM stays active.
It creeps into the seams
After it's sprayed it keeps moving into cavities and behind panels, where salt sits.
It goes over existing rust
No stripping first. It stops the spread, and a fresh coat every fall keeps a frame alive for years.
Out of the bay
Before, and an hour later
Real vehicles that came through the bay on Lapeer Road. The rust ones are what people drive in with. The dark ones are an hour later.
On the rack
Before
Before
After
BeforeAfter
Customer
BeforeCustomer
After
Before
After
Customer
Trailer
CustomerHow a visit works
Drop it off, drive it out
Send the vehicle over
Year, make and model, plus a photo of the underside if you have one. We'll confirm your price, usually the same day.
Pick a time
Any day from 9 AM to 10 PM, by appointment, so your vehicle isn't waiting in line.
Drop it off
Stay and wait, or drop the keys in the box and go. Most jobs are about an hour on the rack.
Back on the road
Pay at the shop, and come back next fall for the touch-up.
Questions
Questions people ask
- How long does undercoating take at Underline Undercoating?
- About an hour for most vehicles, start to finish. You can wait, or drop the keys in the box and come back. The shop is at 2498 Lapeer Rd in Port Huron, open seven days, 9 AM to 10 PM, by appointment.
- How much does rust proofing cost in Port Huron?
- The prices are on this page. Full underbody protection depends on vehicle size, the annual touch-up and the wash, degrease and frame flush are flat prices, and descaling is billed by the hour. Commercial vehicles and trailers are quoted per unit. Send your vehicle through the quote form and we'll confirm your price, usually the same day.
- Do I have to book online?
- No, you can't book online. Send a quote request or call (810) 357-3023, we'll confirm the price, and we'll set a time that suits you.
- Is rust proofing the same as undercoating?
- Here, yes. Rust proofing is what the job does, and undercoating is where it goes. We spray FLUID FILM® into the frame rails, rocker panels, cavities and behind the panels, as well as the underside you can see from the floor.
- How often should a vehicle be undercoated in Michigan?
- Once a year, ideally in the fall before the salt goes down. The annual touch-up is the yearly coat for a vehicle we've already done.
- Can you undercoat a vehicle that already has rust?
- Yes. FLUID FILM® goes straight over surface rust and stops it spreading. Heavy scale gets knocked off first, billed by the hour. If the frame is badly gone, send a photo through the quote form and we'll tell you whether it's worth doing.
- What if I can't stay while it's done, or can't come during the day?
- Use the key drop box. Drop off the vehicle and keys, we do the job, and you pick it up when it suits you.
Something else on your mind?
Ask Rick →Find us
2498 Lapeer Rd, Port Huron
- The shop
- 2498 Lapeer Rd, Port Huron, MI, 48060 · Directions
- Hours
- 7 days · 9 AM – 10 PM · by appointment only · key drop box for drop-off
- Talk to Rick
- (810) 357-3023 · family owned since 2020
Stop it before it starts.
Tell us the vehicle and when you could drop it off. Most jobs take about an hour.