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Crack Filler for polyurea coating prep
- Thread starter TThompson
- Start date
mattthemuppet
Well-known member
I used a sikaflex grey seal on the crack in my garage, after I had ground the edges down. Supposedly it was the wrong product as it was flexible and not hard, but it’s been fine so far
Shea
Well-known member
Use a 100% solids epoxy or polyurea concrete repair product. Are you repairing cracks or something more?What have you used to fill defects in concrete prior to polyurea application?
Can you recommend one? Prefer Sika products. Repairing small breakage where carpet tack strips had been nailed to the concrete. Also filling 1/2" diameter drilled holes.Use a 100% solids epoxy or polyurea concrete repair product. Are you repairing cracks or something more?
Shea
Well-known member
This is the product to use if you prefer Sika and have it readily available to you. Once it cures, grind it flush for a seamless repair.Can you recommend one? Prefer Sika products. Repairing small breakage where carpet tack strips had been nailed to the concrete. Also filling 1/2" diameter drilled holes.
luishrndz9369
New member
For filling defects in concrete before applying polyurea, I’ve had good results with epoxy-based fillers or fast-curing urethane repair products. These materials bond well with concrete, cure quickly, and provide a smooth, durable surface for polyurea adhesion. For smaller cracks or pits, a self-leveling epoxy works great, while for larger voids, a sandable mortar mix or patching compound may be better. Make sure to grind and prep the surface thoroughly to remove loose material and ensure a strong bond. What’s your go-to filler?
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I used this product to fill the cracks in my garage prior to putting down epoxy. It's been good for a year now and you'd have no idea the floor was cracked.
Shea
Well-known member
Do not use caulk. It will shrink over time and polyurea will not adhere to it. Do not use a self-leveling crack sealant. These are too flexible and polyurea will not adhere to it. Use a 100% solids epoxy or polyurea crack filler/repair product. Once you prep the crack and fill it, grind it flush after it cures for a nice even finish. It's like what you would do if filling a crack in wood before painting. We have an article below that discusses concrete crack repair and lists a variety of products to use and where to purchase them. Good luck!Best Crack Filler for Polyurea Coating?
Hey everyone,
I'm prepping my garage floor for a polyurea coating and want to make sure I use the right crack filler before applying the coating. I've seen some recommendations for epoxy-based fillers and self-leveling caulk, but I want something that will bond well and not cause adhesion issues with the polyurea.
For those who have done this before—what products have worked best for you? Any specific brands or techniques to ensure a smooth and durable result? Also, should I be concerned about flexibility vs. rigidity in the filler to prevent future cracking under the coating?
Appreciate any insights!