Grill maintenance
High-Heat Grill Paint: How to Touch Up Rust on a Grill the Right Way
Surface rust on a grill's exterior looks bad and spreads if ignored. A can of high-heat paint can make a tired grill look sharp again, but only if it goes on the right parts, over proper prep, and stays well away from anything food touches.
This guide covers where to paint and where not to, how to prepare and apply high-heat paint, how to cure it, and how to tell when rust has gone past cosmetic.
Quick answer
- Paint only the outside of the grill: lid exterior, outer firebox, legs and cart. Never paint grates, the inside of the firebox or anything food contacts.
- Use paint labeled for high temperatures and for grills or stoves, and check its stated temperature rating.
- Prep is most of the job: remove loose rust, scuff, clean and dry before painting.
- Apply several light coats rather than one heavy coat, then cure per the can's directions.
- Holes, flaking you can push through, and rust on structural parts are beyond paint.
Where you can and can't paint
| Part | Paint it? | Notes |
|---|---|---|
| Lid exterior | Yes | Use high-heat paint; mask the thermometer and handle |
| Outside of the firebox | Yes | High-heat paint rated for grill exterior temperatures |
| Legs, cart, shelves, frame | Yes | High-heat or rust-inhibiting paint depending on distance from heat |
| Cooking grates | No | Clean, season or replace instead |
| Inside of firebox or lid | No | Clean and let seasoning build; replace if rusted through |
| Burners, heat tents, flavorizer bars | No | Replace when rusted |
| Porcelain-enameled surfaces | Usually no | Paint adheres poorly; chips are cosmetic unless rusting through |
| Stainless steel | Usually no | Clean with a stainless cleaner instead |
High-heat paints are not food-safe coatings. Keep paint off grates, griddle surfaces, the inside of the cookbox and anything that touches food or drips onto food. If your manufacturer sells touch-up paint for your model, its instructions take priority.
Choosing the paint
- Look for paint labeled for grills, stoves or high-heat use, and check the stated maximum temperature on the can.
- Choose a rating that comfortably covers the part you're painting. The lid and firebox get much hotter than the legs or shelves.
- Match the finish, usually flat or satin black, to the rest of the grill.
- For cart and frame parts that don't get hot, a rust-inhibiting outdoor metal paint may be fine. High-heat paint works there too.
- Check the can for primer guidance. Some high-heat paints are designed to go straight onto prepared bare metal.
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Prep: where the job succeeds or fails
- Disconnect and remove. Turn off and disconnect the gas, remove the propane tank, and take off grates and anything removable. Let everything cool.
- Clean off grease. Degrease the exterior with warm soapy water or a grill-safe degreaser. Paint won't stick to grease.
- Remove loose rust and paint. Use a wire brush, sanding block or wire wheel on a drill. You want to remove everything loose and feather the edges of sound paint so new paint blends in.
- Scuff the surrounding area. A light sanding gives new paint something to grip.
- Wipe clean and dry. Remove dust with a clean cloth and let everything dry completely.
- Mask. Cover the thermometer, handles, logos, control panel, hoses and anything you don't want painted. Cover the ground and nearby surfaces against overspray.
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Painting
- Paint outdoors in calm, dry weather within the temperature and humidity range on the can, and wear the protection the label recommends.
- Shake the can thoroughly.
- Hold the can at the distance stated on the label and use light, sweeping passes that start and end past the area being painted.
- Apply several thin coats, waiting the stated time between coats. Heavy coats run and can blister when heated.
- Let the paint dry for the full time on the can before reassembling.
Curing
Many high-heat paints need heat to cure fully and reach their final hardness and durability. The can will give a curing method, often a series of heat cycles at gradually rising temperatures. Follow those directions. On a grill, that usually means running it at low heat, then medium, then higher, with cool-downs in between.
Some smoke and odor during the first heat cycles is typical as the paint cures. Keep the grill outdoors in an open area and keep people and pets back. Don't cook food until curing is complete.
When rust is beyond paint
- Holes, or metal so thin you can push a screwdriver through.
- Rust on the inside of the firebox that's flaking into the cooking area.
- Rusted-through legs, joints or welds that make the grill unstable.
- Rust around gas valves or the manifold.
Those are structural or safety problems. Contact the manufacturer about replacement parts, or consider replacing the grill. Our guide to winterizing and storing your grill covers how to slow rust from coming back.
Keeping rust from coming back
- Use a breathable cover and lift it occasionally to let moisture out.
- Empty the grease tray and keep it from overflowing; grease holds moisture.
- Keep the grill off wet grass and puddles; a grill mat or pavers help.
- Touch up small chips quickly before rust spreads.
- Store in a dry, ventilated place in the off-season if you can.
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If rust keeps returning on stainless parts, our guide to 304 vs 430 stainless steel explains why some grades rust more easily.
Tips by grill type and material
Painted steel kettles and barrel grills
Many charcoal grills have porcelain-enameled bowls and lids, which don't take paint well and usually don't need it unless rust is coming through a chip. Barrel-style charcoal grills and many budget gas grills use painted steel, which is ideal for high-heat paint touch-ups. Work in sections so you can feather each edge neatly.
Cast aluminum fireboxes
Cast aluminum doesn't rust the way steel does, though it can corrode and the paint on it can flake. If you're refinishing cast aluminum, check that the paint you choose is suitable for aluminum, and clean off oxidation thoroughly before painting.
Steel carts and frames
Cart frames don't get as hot as the firebox, so prep matters more than paint temperature rating. Pay attention to joints, welds and the bottoms of legs, where water sits. A rust converter product, used according to its directions, can be useful on pitted areas you can't fully clean back to bare metal, provided the paint you choose is compatible with it.
Small chips vs full refinishing
For a few small chips, a touch-up with a small brush or a careful short spray can be enough. For widespread peeling, a full refinish of the panel looks better, since spot repairs on large areas often show as patchy. Either way, the prep steps are the same.
Good habits
- Do touch-ups early in the season, when you have time for the full cure before regular cooking.
- Keep the can for future touch-ups so the color and sheen match.
- Record which paint you used on a piece of tape inside the cabinet door.
FAQ
Can you paint the inside of a grill?
No. High-heat paints aren't food-safe coatings and the inside of the firebox gets hotter than most paints are rated for. Clean the inside and replace parts that have rusted through.
What paint should I use on a grill?
Paint labeled for grills, stoves or high-heat use, with a temperature rating that covers the part you're painting. Check whether your manufacturer sells a touch-up paint for your model.
Do I need to cure high-heat grill paint?
Many high-heat paints need heat cycles to cure fully. Follow the curing directions on the can before you cook on the grill again.
Can you paint over rust on a grill?
Remove loose rust first, then paint. Painting over loose rust leads to peeling. If the metal is rusted through or very thin, paint won't fix it.
Bottom line
High-heat paint is a great way to refresh a grill's exterior: the lid, outer firebox, legs and cart. Keep it off grates and anything food touches, choose a paint rated for the heat, and do the prep properly, because that's what makes the finish last. Cure it as the can directs before cooking. If rust has eaten through metal or reached structural or gas parts, it's time for replacement parts or a new grill.