Sika Sikaflex-221 - Black - Multi-purpose polyurethane sealant/adhesive
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24,450 reviews
covering
50+ products
for the category
Industrial Adhesives, Sealants & Lubricants
Experiential insights by users
About Sika Sikaflex-221 - Black - Multi-purpose polyurethane sealant/adhesive
Overall Feedback:
76% positive
73% liked the easy application process
I found the product excellent and easy to apply with a nice look.
I advise wearing proper protection, including gloves, while using it as it is easy to use.
I found the product excellent and easy to apply, giving a nice look.
I have been using the product for 10 years and have never faced any leaks on any repairs I have done.
77% praised for its exceptional bonding strength
The adhesive has bonded very well.
This product is engineered to meet the need for bonding urethane to urethane and comes from a quality manufacturer known for producing quality products.
The adhesive has bonded well to the plexi sheet and window, and has withstood wind force from driving without any issues.
69% praised for its long shelf life
I have used this adhesive in all wood construction applications and it has a long shelf life. I bonded 2x3 boards directly to the fiberglass and screwed the shelf into those boards. It still remains as solid as the day I put it up.
68% appreciated the fast curing time
The product can be applied down to 40F and sets up in 24 hours, fully curing in 7 days.
After a couple of weeks, the adhesive is still solid and has not shown any signs of weakness or degradation.
70% appreciated the minimal surface preparation required
The adhesive has great adhesion to both bare metal surfaces and painted metal surfaces.
73% praised for its wide temperature tolerance
The product can be applied down to 40F and fully cures in 7 days, setting up in 24 hours.
