Will this adhere well to wood?

This stuff sticks to anything better than any product I've ever used. It will stick to wood really well.

Would this work to attach flexible solar panels to the roof of a cargo van?

Contrary to the other answers, the Sikaflex manufacturer's website indicates that it is also a high strength adhesive: Sikaflex®-221 is a high-quality multi-purpose non-sag 1-c polyurethane sealant/adhesive. Sikaflex®-221 bonds well to a wide variety of substrates and is suitable for making permanent elastic seals of high adhesive strength. Suitable substrate materials are wood, metals, metal primers and paint coatings (2-c systems), ceramic materials and plastics.

would this be great stuff to seal an aluminum enclosed trailer roof?

I am on a horse trailer forum and this was recommended by several people with 60+ years in trailer repair. They swear by it.

Can 221 be used for Aluminum Boat repair below water line?

Not positive but think it can not be used like that

Ap Products 017 90892 Sikaflex 221 Aluminum Gray

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Seal the deal with Sikaflex-221 — where strength meets speed!

FINISH LIKE A PRO - Sandable and paintable for a flawless, professional finish that blends perfectly with your work.
UNMATCHED DURABILITY - Engineered to withstand relentless road shocks and tears, ensuring your projects last mile after mile.
FAST TRACK YOUR REPAIRS - Rapid curing formula means less downtime and faster project completion—get back on track in no time.
CERTIFIED SAFE RELIABLE - NSF approved for potable water and incidental food contact—trust in safety without compromise.
VERSATILE SURFACE BONDING - Seamlessly bonds with aluminum and multiple surfaces, perfect for trucks, RVs, trailers, and buses.

Sikaflex-221 by AP Products is a top-tier one-component polyurethane sealant and adhesive, delivering fast curing, exceptional elasticity, and superior cut and tear resistance. Designed for heavy-duty applications in trucks, trailers, RVs, and buses, it offers weatherproof, sandable, and paintable properties, plus NSF certification for potable water safety. Packaged in a convenient 10 oz aluminum gray tube, it’s the go-to solution for professionals demanding durable, reliable bonding that stands the test of time.

Specifications

ASIN	B004RCX8XS
Best Sellers Rank	#50,810 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #23 in Polyurethane Adhesives
Brand	AP Products
Brand Name	AP Products
Color	Aluminum Gray
Compatible Material	Aluminum
Container Type	Tube
Customer Reviews	4.5 out of 5 stars 298 Reviews
EU Spare Part Availability Duration	5 Years
Included Components	Auto part, Automotive Accessories, Replacement and Performance parts
Item Form	Product
Item Package Quantity	1
Item Type Name	Sikaflex 221 Alum Gray 30
Item Weight	0.95 Pounds
Manufacturer	AP Products
Material	Polyurethane-based adhesive
Material Type	Polyurethane-based adhesive
Model	1790892
Other Special Features of the Product	Extra-strong bonding capabilities, Heat Resistant, Moisture Resistant, Durable, Sandable, Paintable, NSF Approved for Food Contact
Part Number	017-90892
Special Feature	Extra-strong bonding capabilities, Heat Resistant, Moisture Resistant, Durable, Sandable, Paintable, NSF Approved for Food Contact Special Feature Extra-strong bonding capabilities, Heat Resistant, Moisture Resistant, Durable, Sandable, Paintable, NSF Approved for Food Contact See more
Specific Uses For Product	Bus, RV, Trailer, Truck
UPC	338860051048
Unit Count	10.1 Fluid Ounces
Viscosity Level	Medium
Volume	300 Milliliters
Warranty Description	Manufacturer Warranty
Water Resistance Level	Waterproof

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