“Great product, great people! Great results!! So much added depth and gloss! Looking forward to getting more!”
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404 TopCoat
$22.99
Free US shipping · 30-day money-back guarantee
Description
404 TopCoat is the replenishment layer: a spray-on gloss and hydrophobic booster that brings water beading back in minutes — on bare paint, or on top of a coating whose beading has started to fade.
What you get
- Instant gloss and beading. Mist on, spread thin, buff — a full vehicle in about 10–15 minutes, no hose or driveway required.
- Restores a fading coating. Reinforces the layer underneath as its performance eases off, postponing a full re-coat.
- Works standalone too. On uncoated paint it delivers months of spray-topper gloss and water behavior between deeper details.
- Same chemistry family as Hydro Silk — designed to work with the 404 system, not fight it.
How to apply
- Start with a clean, cool, dry panel. Remove heavy contamination first.
- Mist lightly onto the panel or onto a clean microfiber towel. Less is more.
- Spread evenly across a small section — thin, uniform, one pass.
- Level and buff immediately with a clean dry towel. Do not let it dry before wiping.
- Work in shade and avoid hot panels. No water for 8 hours, no washing for 72.
When should I use it?
Two jobs: as a booster whenever water stops beading the way it did after coating — typically a few months in — and as a quick standalone gloss layer on any clean paint. If you run Hydro Silk, TopCoat is what stretches the time between coating applications.
Is this the same as a ceramic coating?
No — and we'd rather tell you that than sell you confusion. TopCoat is a spray topper: fast, easy, and measured in months. A true wipe-on coating like Hydro Silk builds a longer-lived layer and is measured in a year. They're steps in one system: coat once, top up between coats.
What if it doesn't work for me?
Every order is covered by our 30-day money-back guarantee.
Reviews
What customers say
4.8 out of 5 · 523 reviews
- Verified buyer
So far I like the product
So far I like the product, I am still working with it to see how much better I feel about the product
- Verified buyer
Amazing gloss! The application was tougher than I thought.
Amazing gloss! The application was tougher than I thought and wore me out; however, the buffing was a breeze. The product seemed to be really thick and not very easy to spread out. The end result was phenomenal! Took an entire bottle to fully coat my Nissan Kicks.
- Verified buyer
Great product! Your car will shine like diamonds
- Verified buyer
Works well, could be a bit easier to apply.
Works well, pump lotion can be a bit tedious to apply. Will see how it lasts over my graphene ceramic coating.
- Verified buyer
Very nice product it is great
Very nice product it is great. Excellent shine excellent texture. Feel the paint made my truck look amazing goes down the road and gets people looking from every side.
- Verified buyer
Best product I tried so far! My car looked fantastic after application of the coat. And plus points for their excellent customer support. I needed some guidance for after application and they were able to give me a good insight of what could possibly happeened and gave me options on how to address and fix those. I’ll definitely repurchase and try the other products they offer.
The proof
Real coats. Real beads.
Real owners.
5-star community reviews across 3,000+ vehicles protected.
“Sure looks nice and clean with Chemical 404 taking the paint to a whole new level of shine!”
“Hydro Silk for the win! Thank you for keeping the Grom in the best shape from all the dust, pollen, bugs and more. The one and only for your protection!”
“I gave Big Panda a bath and hit it with that Chemical 404 Hydro Silk.”
“Incredible product. Blown away by the depth of gloss after one application. Genuinely the slickest finish I’ve ever felt on my paint.”
“As a professional detailer for 25+ years, I must say this product is top tier!!! The ease of application to the removal, and best part — you get absolutely no fingerprints left once applied. Even my high-end ceramic gets oily fingerprints.”
The do-it-all set
Get the trio
Three bottles, one complete system. Hydro Silk lays down the deep glow and razor-sharp gloss. Topcoat refreshes the hydrophobic layer as it wears. Detailer keeps the finish clean, slick, and UV-armored between sessions.
Shop the trio