can one put a second cost on first in the crack?

Not sure what you're asking. Applying a second coat to a crack in the stuff that's already there? If that is the question, you can, but it won't last. If you're in a rental it beats waiting for the landlord to act. If it's your property, best to do it right instead.

Is this a good option to seal small outside cracks around some windows? and then ok to mortar over this? please advise...thanks!

I have had good results using this product to seal cracks in concrete walkway & driveway but never around windows nor have I tried to mortar over it.

Does this have any benefits over real morter to fill cracks or its just easier to use?

Can be used to fill small cracks only.

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DAP Concrete and Mortar Filler and Sealant, Gray, 10.1 Oz (7079818096)

Product ID: 14120368

Details

Brand
DAP
Item Weight
10.1 Ounces
Item dimensions L x W x H
2 x 2 x 11.25
Material
Silicone
Style
Tube

💧100% waterproof & weatherproof seal

⏱️24-hour return to service time

🛠️10.1 oz ready-to-use tube

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C$1247

Duties & taxes included

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Sold byAmazon NicaraguaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Seal it, forget it — concrete cracks don’t stand a chance!

PAINT READY FINISH - Compatible with latex and oil-based paints for seamless, professional results.
FLEXIBLE LOW ODOR - Silicone-enhanced adhesive flexes with surfaces and cleans up easily with water.
UNMATCHED DURABILITY - Resists gasoline, salt, grease, and oil for long-lasting concrete protection.
EFFORTLESS APPLICATION - Ready-to-use formula means no mixing or additives—start sealing cracks instantly.
INTERIOR EXTERIOR USE - Versatile sealant designed to perform in any environment, rain or shine.

DAP Concrete and Mortar Filler & Sealant is a 10.1 oz gray, ready-to-use silicone-enhanced paste that creates a flexible, 100% waterproof seal on concrete and masonry surfaces. It cures quickly with a 24-hour return to service, resists harsh chemicals like gasoline and salt, and is paintable with both latex and oil-based paints. Ideal for both interior and exterior repairs, this low-odor, easy-cleanup sealant delivers professional-grade durability and versatility.

Specifications

ASIN	B000H5S09G
Best Sellers Rank	#767 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #4 in Hardware Sealers
Brand Name	DAP
Color	Gray
Compatible Material	Concrete
Customer Reviews	4.5 4.5 out of 5 stars (4,776)
Global Trade Identification Number	00070798180215
Included Components	1 Tube
Item Dimensions	2 x 2 x 11.25 inches
Item Form	Paste
Item Type Name	concrete sealant
Item Weight	10.1 Ounces
Manufacturer	DAP PRODUCTS INC.
Material Type	Silicone
Model	7079818096
Number of Items	1
Part Number	7079818096
Style Name	Tube
Surface Recommendation	Exterior/Interior
UPC	070798180215
Unit Count	10.1 Ounce
Warranty Description	If not satisfied with product performance when used as directed, return used container and sales receipt to DAP Products Inc., Technical Customer Service, 2400 Boston St., Suite 200, Baltimore, MD 21224, for product replacement or sales price refund. DAP will not be liable for incidental or consequential damages.
Water Resistance Level	Waterproof

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Customer service was outstanding when I had questions about the product.

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The product exactly matches the description. Very satisfied with my purchase.

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