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Putty vs. Mastic — What's the Difference?

By Fiza Rafique & Maham Liaqat — Updated on May 12, 2024
Putty is primarily used as a sealant for glass windows and to fill small holes, offering a paintable finish; mastic is a strong adhesive used for tiles and ductwork, often remaining flexible.
Putty vs. Mastic — What's the Difference?

Difference Between Putty and Mastic

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Key Differences

Putty is a pliable, moldable substance made from a mixture of whiting and linseed oil, commonly used to set glass in window frames and patch minor surface defects in wood. Whereas, mastic is an adhesive and sealing compound that comes in both thin liquid and thick paste forms, designed to bond tiles, concrete, and other building materials.
Putty is favored for its easy application and adjustability before it sets, making it ideal for craftsmen who need a forgiving material. On the other hand, mastic sets quickly and creates a durable, moisture-resistant bond, which is crucial in areas exposed to water, like bathrooms and kitchens.
The drying time of putty can vary from a few hours to weeks, depending on the type and conditions, allowing for adjustments after application. Mastic, however, typically dries faster, minimizing the time required to hold materials in place.
Putty can be painted over once it has dried and hardened, making it an excellent choice for use in finishing and repair works where aesthetics are important. Conversely, mastic may remain visible and sometimes cannot be painted over, which may affect the final appearance of a project.
While putty is generally more suitable for smaller, less critical tasks like sealing window panes or filling minor cracks, mastic is used for heavier applications that require strong, long-lasting adhesion, such as setting wall tiles or attaching kitchen backsplashes.
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Comparison Chart

Composition

Whiting and linseed oil
Various chemicals, often acrylic

Primary Use

Sealing glass, filling small holes
Tile adhesive, heavy-duty bonding

Flexibility after drying

Hardens, minimal flexibility
Remains flexible

Paintability

Can be painted over
Often not paintable

Drying Time

Slow, allows for adjustments
Fast, secures quickly

Compare with Definitions

Putty

Often composed of linseed oil and whiting.
The traditional putty is made from linseed oil and whiting.

Mastic

Adhesive used for tiles and heavy materials.
He used mastic to attach the ceramic tiles to the wall.

Putty

Needs time to dry and harden.
The putty must dry completely before you can paint over it.

Mastic

Stays flexible after application.
The mastic beneath the bathroom tiles allows for slight movements.

Putty

A material used to seal glass in windows.
He applied putty to the window frame to secure the pane.

Mastic

Not typically paintable.
The mastic on the edges cannot be painted, so it needs to be applied neatly.

Putty

Can be painted after setting.
Once the putty has set, it can be painted to match the surrounding wood.

Mastic

Sets quickly to provide strong adhesion.
The mastic set quickly, holding the tiles in place firmly.

Putty

Soft, malleable filler used to repair wood.
She used putty to fill the nail holes in the baseboard.

Mastic

Used in wet areas due to moisture resistance.
Mastic is preferred in showers for its moisture resistance.

Putty

Putty is a material with high plasticity, similar in texture to clay or dough, typically used in domestic construction and repair as a sealant or filler. Although some types of putty (typically those using linseed oil) slowly polymerise and become stiff, many putties can be reworked indefinitely, in contrast to other types of filler which typically set solid relatively rapidly.

Mastic

The mastic tree.

Putty

A doughlike cement made by mixing whiting and linseed oil, used to fill holes in woodwork and secure panes of glass.

Mastic

The aromatic resin of the mastic tree, used in varnishes and as a flavoring and formerly in chewing gum and as a medicine.

Putty

A substance with a similar consistency or function.

Mastic

Any of various substances used as an adhesive or sealant.

Putty

A fine lime cement used as a finishing coat on plaster.

Mastic

A pastelike cement used in highway construction, especially one made with powdered lime or brick and tar.

Putty

A yellowish or light brownish gray to grayish yellow or light grayish brown.

Mastic

An evergreen shrub or small tree, Pistacia lentiscus (mastic tree), native to the Mediterranean.

Putty

To fill, cover, or secure with putty.

Mastic

A hard, brittle, aromatic and transparent resin produced by this tree and used to make varnishes and chewing gum, and as a flavouring.

Putty

A form of cement, made from linseed oil and whiting, used to fix panes of glass.

Mastic

An alcoholic liquor flavoured with this resin.

Putty

Any of a range of similar substances.

Mastic

A flexible, waterproof cement used as an adhesive, sealant or filler.

Putty

An oxide of tin, or of lead and tin, used in polishing glass, etc.

Mastic

A low shrubby tree of the genus Pistacia (Pistacia Lentiscus), growing upon the islands and coasts of the Mediterranean, and producing a valuable resin; - called also, mastic tree.

Putty

A fine cement of lime only, used by plasterers.

Mastic

A resin exuding from the mastic tree, and obtained by incision. The best is in yellowish white, semitransparent tears, of a faint smell, and is used as an astringent and an aromatic, also as an ingredient in varnishes.

Putty

A golf ball made of composition and not gutta-percha.

Mastic

A kind of cement composed of burnt clay, litharge, and linseed oil, used for plastering walls, etc.

Putty

Of, pertaining to, or resembling putty.

Mastic

An aromatic exudate from the mastic tree; used chiefly in varnishes

Putty

(transitive) To fix or fill using putty.

Mastic

A pasty cement used as an adhesive or filler

Putty

A kind of thick paste or cement compounded of whiting, or soft carbonate of lime, and linseed oil, when applied beaten or kneaded to the consistence of dough, - used in fastening glass in sashes, stopping crevices, and for similar purposes.

Putty

A ball made of composition and not gutta percha.

Putty

A kind of gaiter of waterproof cloth wrapped around the leg, used by soldiers, etc.

Putty

To cement, or stop, with putty.

Putty

A dough-like mixture of whiting and boiled linseed oil; used especially to patch woodwork or secure panes of glass

Putty

Apply putty in order to fix or fill;
Putty the window sash

Common Curiosities

Can mastic be used as a substitute for putty?

Mastic is not typically used as a substitute for putty because it has different adhesive properties and flexibility.

How long does putty take to dry?

The drying time for putty can vary but typically ranges from a few hours to several weeks.

What is the primary use of putty?

Putty is primarily used to seal glass in windows and to fill small holes in wood.

What makes mastic suitable for tiling projects?

Mastic provides strong, durable adhesion and moisture resistance, which are essential qualities for tiling projects.

What are some common uses of mastic?

Common uses include setting tiles, bonding building materials, and sealing ductwork.

How should mastic be applied for best results?

Mastic should be applied evenly and carefully, following the manufacturer’s instructions for the best adhesion.

Can putty be used to fill large gaps?

Putty is best suited for small gaps and repairs; larger gaps might require a different type of filler.

What are the disadvantages of using putty?

Putty dries slowly and lacks the structural strength provided by other adhesives like mastic.

Is putty paintable?

Yes, putty can be painted over once it has dried and hardened.

Is mastic resistant to water?

Yes, mastic is moisture-resistant, which makes it suitable for use in areas like bathrooms.

Can putty be used outdoors?

Yes, but it should be properly sealed and painted to protect against weather conditions.

Can mastic be used on wooden surfaces?

While mastic can adhere to wood, it is generally not recommended for use where flexibility and aesthetics are concerns.

What are the advantages of mastic in construction?

Mastic is valued for its quick-setting, flexibility, and strong bond, making it ideal for heavy-duty applications.

Is it necessary to prepare surfaces before applying putty?

Yes, surfaces should be clean and dry to ensure the putty adheres well and performs as expected.

What safety precautions should be taken when using mastic?

Adequate ventilation, gloves, and possibly a mask should be used when applying mastic due to its strong chemical composition.

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Author Spotlight

Written by
Fiza Rafique
Fiza Rafique is a skilled content writer at AskDifference.com, where she meticulously refines and enhances written pieces. Drawing from her vast editorial expertise, Fiza ensures clarity, accuracy, and precision in every article. Passionate about language, she continually seeks to elevate the quality of content for readers worldwide.
Co-written by
Maham Liaqat

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