Okay, so here is the honest version. For about $9 you can silver the back of a thrifted frame's glass and end up with a piece that reads as a real mirror from across a room. It beats Rust-Oleum Mirror Effect on coverage, on spray evenness, and on mercury-glass distressing, and it needs no primer and no sanding. But the silver layer scratches with a fingernail, standing water hazes it permanently, and clear coats fog it. Buy it for decor behind glass. Do not buy it for a mirror you use.
Spec Sheet
- COVERAGE
- About 7 sq ft per 6-oz can
- FINISH
- High-gloss, mirror-like silver (one color)
- DRY AND HANDLE
- Touch dry 15 min · handle 30 min
- BETWEEN COATS
- About 1 minute; closer to 10 on a humid day
- COATS NEEDED
- 5 light coats on the label; 7–8 on a big pane
- FULL CURE
- 24–48 hours before heavy handling or any topcoat
- PRIMER
- None; sprays straight onto clean clear glass
- SURFACES
- Glass only, interior use, applied to the reverse side
- VOC
- Solvent-based aerosol; not low-VOC. Use outdoors or with strong ventilation
- BEST CONDITIONS
- 55–75°F, humidity under 60%
- CLEANUP
- Mineral spirits while wet; razor-blade scraping once dry
- PRICE
- $8–13 per 6-oz can, usually about $9–10
Dry in Minutes, Cured in Two Days
The timings on this can are quick and a little misleading, so here is what they actually mean for your Saturday. Touch dry is about 15 minutes. Handleable is 30. Between coats you only wait about a minute — closer to ten if the air is humid — which is why five light coats fit into one morning. Full cure is 24 to 48 hours, and that is the number that matters. Do not put anything over the silver, and do not handle the piece hard, until those two days are up. If you are going to add an opaque backing coat to protect the silver, that also waits for the full cure. And one thing that trips up every first-timer: while you are spraying, it looks like flat gray paint. That is normal. The mirror only exists when you flip the glass over and look through the front.
When It Goes Wrong — and How to Fix It
It dried flat gray instead of mirror-like
Why it happens: Almost always under-shaking, heavy coats, or both. The metallic particles settle to the bottom of the can, and the ten-second rattle you give a normal spray can does not lift them back into the mix. A thick wet coat also dries dull.
The fix: Shake the can for a full 1 to 2 minutes before you start, and shake it again partway through the job. Then spray light dusting passes from 10 to 12 inches away. If it looks wet and shiny while you are spraying, you are too close or moving too slowly. Several thin coats dry reflective; one thick one never does.
The coat came out milky, streaky, or blotchy
Why it happens: Three usual suspects: the glass was not perfectly clean, the coats were too heavy, or the day was humid. Humidity is the one people ignore, and it gives you a milky coat that will not smooth out no matter how many passes you add.
The fix: Do not try to bury blotches under more paint — it never works. Strip the pane and start over: mineral spirits while it is wet, or a razor blade softened with mineral spirits or acetone once it is dry. Then respray on a dry day under 60% humidity, on glass you cleaned twice, alternating spray direction every coat.
Dark flecks and smudges show through the front
Why it happens: A fingerprint, a dust speck, or a stray fiber landed on the glass before the spray did. Every one of those seals in under the silver, and from the front it reads as a permanent dark mark. You cannot fix it later.
The fix: Wash both sides with glass cleaner or rubbing alcohol before you start, then handle the glass by the edges only. Lay it flat, back side up — flat matters, because this spray is thin enough to run on a vertical pane. Put down more drop cloth than you think you need, because overspray drifts.
A clear coat fogged the mirror
Why it happens: This is the classic ruined-project moment. The instinct is to toughen the soft silver with a clear coat, and standard clear coats — polyurethane, generic acrylic sealers, that can of clear gloss on your shelf — fog and dull the mirror effect almost immediately. You watch the reflection go milky in real time.
The fix: Protect it with something opaque instead. You are looking at the silver through the glass, so anything on top of it is invisible from the front. After the 24 to 48 hour cure, spray a coat of flat black or gray over the silver, or just reassemble the frame with the backing board pressed tight against the painted side.
You can still see through it
Why it happens: At one or two coats the film is semi-transparent. That is not a defect — it is exactly how DIY one-way and infinity mirrors work — but if you wanted a solid mirror, you stopped too early.
The fix: Keep going. Five light coats is the label's number and a genuine minimum; on a door-size pane DIYers report 7 to 8 coats and just over two cans. Before your last coat, hold the glass up to a window or lamp and look for bright spots where light punches through. Those are your thin areas. Give them one more pass.
Application Settings That Work
- PRIMER
- There is no primer step and no sanding — you spray straight onto clean clear glass, on the back side. The whole prep is cleaning: wash both sides with glass cleaner or rubbing alcohol, then handle the glass by the edges only so no fingerprints get sealed in under the silver. Lay it flat, back side up, somewhere with real airflow, and shake the can a full 1 to 2 minutes before the first pass.
Looking Glass vs Rust-Oleum Specialty Mirror Effect
These two are the whole category, so this is the comparison worth doing properly. They look close on paper and behave clearly differently in the can.
| Krylon Looking Glass | Rust-Oleum Specialty Mirror Effect | |
|---|---|---|
| Can size | 6 oz | 6 oz |
| Street price | About $9 | About $9 |
| Coverage | About 7 sq ft | About 4 sq ft |
| Dry to touch | About 15 min | About 10 min |
| Spray pattern | Fine, even mist; does not pool | Heavier; the first coat can puddle and go splotchy |
| Odor | Strong | Noticeably milder |
| Mercury-glass distressing | Lifts in tiny, authentic speckles | Releases in large wiped-off patches |
Mercury glass, distressed pieces, or any job where you want thin even coats: Krylon, and it is not close. The finer mist does not pool, the coverage is nearly double per can so the same shelf price is not the same project cost, and the vinegar distressing breaks into small speckles that look like an old mirror losing its silver instead of big wiped-off patches. Pick Rust-Oleum if fumes are your real limit — in an apartment or a basement that is a legitimate reason — or if you want the brightest reflection on a flat pane and you are not distressing anything. Plenty of people on the DIY forums find Krylon reads a touch more aged and smoky, so that preference is real.
What It's Good At
- +Reading as a real mirror from across a room — bright reflection, even silver, nobody asks what it is
- +Faking antiqued mercury glass, where a vinegar mist on wet paint lifts the silver into small aged speckles
- +Fast turnaround — touch dry in 15 minutes, handleable in 30, a finished craft piece by lunch
- +Skipping prep entirely: no primer, no sanding, just clean glass
- +Covering about 7 sq ft a can, roughly double Rust-Oleum Mirror Effect at the same street price
- +Staying semi-transparent at one or two coats, which is how DIY one-way and infinity mirrors get built
What It's Not Good At
- −Surviving touch — the silver layer marks with a fingernail and dulls within weeks if it gets handled
- −Anything wet; standing water hazes it into permanent cloudy spots
- −Forgiving a humid day or a dusty pane, both of which show up as blotches and dark flecks forever
- −Taking a clear coat — standard clears fog the mirror effect almost instantly
- −Color and surface range: silver only, glass only, and gray paint on anything else
- −Coming off once dry; removal means a razor blade plus mineral spirits or acetone
Honest Alternatives
The one true competitor, at essentially the same street price. Same back-of-glass method, same soft finish. It covers about 4 sq ft to Krylon's 7 and its first coat puddles more easily, but it smells meaningfully less and dries to touch about five minutes faster. If ventilation is your real constraint, that matters more than coverage.
If you want a flawless reflection you can actually use, no spray competes with an actual mirror. A glass shop will cut one to your frame, and it will be sharp, durable, and water-safe. Spend the money here when the mirror has a real job to do.
If what you wanted was a soft frosted, etched-glass privacy look rather than a reflection, Frosted Glass is the right can. Sea Glass gives a pale beachy tint. Both go on glass and are far more durable on the visible side than Looking Glass, because they are meant to be touched.
Looking Glass Questions, Answered
Does Krylon Looking Glass actually make a real mirror?
Sort of. It makes a mirror-like reflective silver coating, not a true bathroom mirror. Spray it on the back of clear glass and you get a soft, slightly cloudy reflection that looks great as decor and a little hazy if you expect a flawless face-checking mirror. For crafts and faux-vintage glass, it reads as a mirror. For shaving, it will not satisfy you.
Which side of the glass do you spray?
The back. You spray the reverse side and look through the clean front, the same way a real mirror is silvered behind the glass. If you spray the front, you will touch and scratch the soft coating and it dulls fast. Clean the front before you start so no smudges get sealed in under the reflective layer.
How many coats of Looking Glass do you need?
The can recommends 5 light coats, and that is the realistic minimum for an opaque, mirror-like result. One or two coats stays semi-transparent. On larger panes, DIYers report 7 to 8 coats and just over two cans for a door-size piece of glass. Wait about a minute between coats, alternate spray direction each pass, and hold the glass up to a light to find thin spots before the final coat.
Why does my Looking Glass paint look gray instead of mirror-like?
Almost always under-shaking or heavy coats. The metallic particles settle, so shake the can for a full two minutes before you start and again during the job, and keep each pass a light dusting from 10 to 12 inches. A thick wet coat dries dull gray; several thin coats dry reflective. And remember it only reads as a mirror from the front of the glass — the sprayed side always looks like gray paint.
How do you fake mercury glass with it?
Mix a spray bottle of 1 part white vinegar to 1 part water — go 1 to 2 for a lighter mottle — and keep a clean white microfiber cloth handy. Spray one light coat on the back of the glass, or the inside if it is a vase. While it is still wet, mist the vinegar over it; you have about a minute of working time. Blot the droplets with the cloth and the silver lifts into aged speckles. Wait 15 to 20 minutes and repeat. Two layers usually gets you there. Once everything is fully dry, a coat of flat black over the silver reads exactly like the dark cloudy patches behind a real antique mirror.
Is Looking Glass durable enough for a tabletop or tray?
Not on its own. The silver layer is soft and scratches with a fingernail, and water sitting on it will haze it over time. For anything that gets handled or wiped, spray the back and then cover the cured silver with an opaque backing, and keep it as decor rather than a working surface. It is a craft and decor finish, not a hard-wearing one.
Can you put a clear coat over Looking Glass?
Be careful. Standard clear coats fog and dull the mirror effect almost instantly. If the piece needs protection, wait out the 24 to 48 hour full cure, then cover the silver with an opaque backing instead: a coat of flat black or gray over the back, or the frame's backing board pressed against it. The reflection lives on the glass side, so an opaque backing is invisible from the front.
Krylon Looking Glass or Rust-Oleum Mirror Effect — which is better?
They cost about the same, roughly $9 for a 6-oz can, but they behave differently. Krylon covers more (about 7 sq ft versus 4), sprays a finer mist that does not pool, and distresses into realistic tiny speckles for mercury glass. Rust-Oleum dries a bit faster (10 minutes versus 15), smells less, and some people find it a touch closer to a true bright mirror on flat panes, though its first coat puddles more easily. For mercury glass and even coats, pick Krylon. If fumes are your limit, pick Rust-Oleum.
How do you remove Looking Glass spray paint?
While it is still wet, mineral spirits take it off easily. Once dried it is stubborn — plan on scraping it off the glass with a razor blade, softening it first with mineral spirits or acetone. That is also the fix when a coat goes splotchy on a humid day: strip the pane and restart rather than trying to bury the blotches under more paint.
Do I need a mask for this one?
Yes, please. This is a solvent-based aerosol, so it is not the low-odor, wipe-up-with-water kind of product. The fumes are strong, the overspray drifts and settles on everything within a few feet, and cleanup is mineral spirits rather than soap. Use it outside or in a garage with the door open and a fan, wear a mask rated for solvents, and lay down more drop cloth than you think you need.
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