Authentic Pizza Ovens Ultra Fire Brick Oven Crack Repair Kit

Description

Hairline cracks on a brick pizza oven are not a defect. Every handmade refractory cement dome moves a little as it heats and cools, and after the first season most ovens show fine lines on the dome and along the seam where the brick face meets the stucco. The Ultra Fire crack repair kit is the patch Authentic Pizza Ovens makes for exactly that, and it is the same tub they pack inside every brick oven they ship. This listing is for owners who used theirs, lost it, or never got one with an oven bought elsewhere.

It is a silicone based, paint consistency patch made in Portugal for the outside of refractory cement ovens. Brush it into the crack while the oven is warm, feather the edge, and it cures with the dome. It also covers chips on the concrete base from delivery or moving. It is never used inside the oven or on any cooking surface.

The Ultra Fire tub as it ships from Authentic Pizza Ovens, made in Portugal.

Why Brick Ovens Crack, and Why It Does Not Matter

A refractory cement dome is cast by hand over fire brick and a thick layer of rock wool insulation. When you fire it, the inner brick reaches several hundred degrees while the outer cement stays cool enough to touch. That difference is the whole point of the insulation, and it is also why the outer skin shows fine cracks: the two layers expand at different rates. The brick and insulation do the cooking. The cement is weather skin. A hairline crack on the skin does not change heat up time, floor temperature, or how long the oven holds heat.

What the crack does do is let rain in if it is left open through a wet season, which is why the oven cover and a patched dome go together. Curing the oven properly on five small fires before the first pizza keeps cracking to a minimum; skipping the cure and lighting a roaring fire on day one is what turns a hairline into a visible line.

Using Ultra Fire

Fire the oven for an hour so the dome is warm, not blazing. Brush the dust out of the crack with a dry paintbrush. Stir the tub, then work the patch into the crack with a small brush or a putty knife and smooth it flush with the surrounding surface. Let it set before the next full fire. Some ovens keep settling through the first season; if a line reopens, add a second thin coat. The tub holds about a half quart and ships looking part empty, which is normal. Seal the lid tight after use and store it cool so it does not skin over.

Ultra Fire goes on the dome, the stucco, the seam at the brick face, and the concrete base. It does not go on the fire brick floor, the inside of the chamber, the ceramic dish, or anything that touches food. Ultra Fire is made for hairline cracks. For a wider crack or a chip with depth, fill it first with a high heat mortar, let that dry fully, then brush Ultra Fire over the top to seal the surface and blend it in. A broken brick is a mortar repair on its own.

The patch going on a warm dome. The same tub is packed inside every Authentic Pizza Ovens brick oven.

Who Should Buy and Who Should Not

Buy it if you own a refractory cement brick oven, from Authentic Pizza Ovens or another Portuguese maker, and want the dome sealed and tidy. Buy it if the tub that came with your oven dried out or went missing. Skip it if your oven is steel or stainless with no cement dome; there is nothing for it to patch. Skip it for interior damage, which needs mortar.

Best way to buy: add this to your pizza oven order. Orders over $750 ship free.

KEY FEATURES

• Exterior crack patch made for refractory cement wood fired ovens
• Silicone based, paint consistency, brushes into hairline cracks
• Same kit Authentic Pizza Ovens packs with every brick oven
• Covers dome cracks, brick face seams, and chips on the concrete base
• About a half quart per tub; reseals for later coats
• Apply while the oven is warm so it cures with the dome
• Outside use only; never inside the chamber or on cooking surfaces
• Hairline cracks only; wider cracks get high heat mortar first, then Ultra Fire to seal
• Made in Portugal, limited availability

SPECIFICATIONS

VIDEO

The application video is in the Using Ultra Fire section above. Here it is again for reference.

Filling hairline cracks on a warm dome with the Ultra Fire kit.

INSTALLATION GUIDE & USER MANUAL

Before the first patch. Cure a new oven first. Five small fires over five days, each a little hotter than the last, let the dome dry and settle before full heat. Most cracking shows up during or just after the cure, so wait until the cure is done and the oven has had a few real fires before you patch; patching too early means patching twice.

Applying. Warm the oven about an hour. Brush the crack clean. Stir the tub. Brush or knife the patch into the line, flush with the surface, and feather the edge. Let it set before the next full fire.

After. Cover the oven once it is cool. Check the dome at the start of each season and touch up any new lines. Keep the tub sealed and cool between uses.

WARRANTY INFORMATION

Ultra Fire is a consumable and carries no separate warranty. Hairline cracks on a refractory cement dome are normal and are not covered under the oven's structural warranty; the oven warranty covers the structure, not surface lines. Patching with Ultra Fire does not affect the oven warranty. Once opened the kit is not returnable.

FREQUENTLY ASKED QUESTIONS - FAQ'S

Your Questions Answered Before You Buy

The questions owners ask most about the Ultra Fire kit before they order. If yours is not here, the chat goes to the owner and a real answer typically comes the same day.