Spec CJ Guard Water-Based, Control Joint Filler Stain Protectant
Spec CJ Guard is a water-based, film-forming polymer protective coating designed to prevent staining of concrete surfaces caused by epoxy or polyurea joint filler overfill.
When applied adjacent to control joints before installation of joint filler, it forms a clear temporary barrier that protects concrete and decorative finishes. After installation and shaving of joint material, the film is easily removed with water, restoring the surface without staining or residue.
It also improves efficiency during shaving operations and is widely used in industrial floors, decorative concrete, and polished concrete applications.
Key Features
- Water-based film-forming polymer system
- Prevents staining from joint filler overfill
- Improves shaving efficiency of control joints
- Easily removable with water after use
- Low odor, VOC compliant formula (~13 g/L)
- Suitable for decorative and polished concrete
- Protects porous concrete surfaces
- Temporary protective barrier system
Applications
Common Uses
- Control joint protection before filling
- Decorative concrete protection
- Polished concrete surface protection
- Stamped concrete joint work
- Industrial floor joint installation
- Epoxy and polyurea joint systems
Works On
- Concrete slabs
- Polished concrete floors
- Colored decorative concrete
- Porous architectural surfaces
- Industrial flooring systems
Packaging
- 1-gallon containers
- 5-gallon pails
- 55-gallon drums
Shelf Life
- Approximately 1 year when stored properly
- Store sealed in original container
- Keep in temperatures between 40–90°F (4–32°C)
- Do not allow to freeze
- Store in dry, controlled environment
Frequently Asked Questions
What is Spec CJ Guard used for?
Spec CJ Guard is used to prevent staining of concrete caused by joint filler overfill during control joint installation.
Does Spec CJ Guard wash off?
Yes. It is a water-based film that is easily removed with water after joint installation and shaving.
Can it be used on decorative concrete?
Yes. It is commonly used on polished, colored, and stamped concrete surfaces.
Does it help with joint shaving?
Yes. It improves the efficiency of shaving epoxy or polyurea joint fillers.
Will it affect bonding of joint filler?
Yes—if misapplied into the joint. It should only be applied to surface areas adjacent to the joint, not inside the joint.
What happens if it is left on too long?
It should be removed after joint work is completed. It is designed as a temporary protective film.
Is Spec CJ Guard VOC compliant?
Yes, it is a low-VOC water-based product (~13 g/L).
What temperature can it be applied at?
It should be applied between 40°F and 90°F (4°C to 32°C).
Technical Data Sheet (TDS Summary)
Product Type
Water-based film-forming polymer concrete protectant
Physical Properties
Milky liquid, low odor, water-based emulsion, ~13 g/L VOC
Performance Characteristics
- Forms temporary protective film on concrete
- Prevents staining from joint filler overfill
- Improves shaving efficiency of joint systems
- Easily removed with water
Application Method
Apply to concrete adjacent to joints → allow to dry → install joint filler → shave → rewet and remove film
Usage Notes
- Do not allow product to enter joint cavity
- Apply only to surrounding concrete surfaces
- Must dry before joint filler installation
Safety Data Sheet (SDS Summary)
Hazard Classification
Low hazard water-based polymer product
Health Hazards
- Mild skin irritation possible
- Mild eye irritation possible
- Low VOC exposure risk
Flammability
- Non-flammable water-based product
PPE Requirements
- Gloves recommended
- Eye protection recommended during application
- Standard ventilation recommended
Safe Handling
- Avoid direct eye contact
- Do not ingest
- Keep container closed when not in use
- Store in controlled temperature environment
First Aid
- Eyes: Flush with water
- Skin: Wash with soap and water
- Inhalation: Move to fresh air
- Ingestion: Seek medical attention if needed
Original: $384.46
-65%$384.46
$134.56
Description
Spec CJ Guard is a water-based, film-forming polymer protective coating designed to prevent staining of concrete surfaces caused by epoxy or polyurea joint filler overfill.
When applied adjacent to control joints before installation of joint filler, it forms a clear temporary barrier that protects concrete and decorative finishes. After installation and shaving of joint material, the film is easily removed with water, restoring the surface without staining or residue.
It also improves efficiency during shaving operations and is widely used in industrial floors, decorative concrete, and polished concrete applications.
Key Features
- Water-based film-forming polymer system
- Prevents staining from joint filler overfill
- Improves shaving efficiency of control joints
- Easily removable with water after use
- Low odor, VOC compliant formula (~13 g/L)
- Suitable for decorative and polished concrete
- Protects porous concrete surfaces
- Temporary protective barrier system
Applications
Common Uses
- Control joint protection before filling
- Decorative concrete protection
- Polished concrete surface protection
- Stamped concrete joint work
- Industrial floor joint installation
- Epoxy and polyurea joint systems
Works On
- Concrete slabs
- Polished concrete floors
- Colored decorative concrete
- Porous architectural surfaces
- Industrial flooring systems
Packaging
- 1-gallon containers
- 5-gallon pails
- 55-gallon drums
Shelf Life
- Approximately 1 year when stored properly
- Store sealed in original container
- Keep in temperatures between 40–90°F (4–32°C)
- Do not allow to freeze
- Store in dry, controlled environment
Frequently Asked Questions
What is Spec CJ Guard used for?
Spec CJ Guard is used to prevent staining of concrete caused by joint filler overfill during control joint installation.
Does Spec CJ Guard wash off?
Yes. It is a water-based film that is easily removed with water after joint installation and shaving.
Can it be used on decorative concrete?
Yes. It is commonly used on polished, colored, and stamped concrete surfaces.
Does it help with joint shaving?
Yes. It improves the efficiency of shaving epoxy or polyurea joint fillers.
Will it affect bonding of joint filler?
Yes—if misapplied into the joint. It should only be applied to surface areas adjacent to the joint, not inside the joint.
What happens if it is left on too long?
It should be removed after joint work is completed. It is designed as a temporary protective film.
Is Spec CJ Guard VOC compliant?
Yes, it is a low-VOC water-based product (~13 g/L).
What temperature can it be applied at?
It should be applied between 40°F and 90°F (4°C to 32°C).
Technical Data Sheet (TDS Summary)
Product Type
Water-based film-forming polymer concrete protectant
Physical Properties
Milky liquid, low odor, water-based emulsion, ~13 g/L VOC
Performance Characteristics
- Forms temporary protective film on concrete
- Prevents staining from joint filler overfill
- Improves shaving efficiency of joint systems
- Easily removed with water
Application Method
Apply to concrete adjacent to joints → allow to dry → install joint filler → shave → rewet and remove film
Usage Notes
- Do not allow product to enter joint cavity
- Apply only to surrounding concrete surfaces
- Must dry before joint filler installation
Safety Data Sheet (SDS Summary)
Hazard Classification
Low hazard water-based polymer product
Health Hazards
- Mild skin irritation possible
- Mild eye irritation possible
- Low VOC exposure risk
Flammability
- Non-flammable water-based product
PPE Requirements
- Gloves recommended
- Eye protection recommended during application
- Standard ventilation recommended
Safe Handling
- Avoid direct eye contact
- Do not ingest
- Keep container closed when not in use
- Store in controlled temperature environment
First Aid
- Eyes: Flush with water
- Skin: Wash with soap and water
- Inhalation: Move to fresh air
- Ingestion: Seek medical attention if needed
