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 Latex Concrete Sealant,Gray, 10.1OZ

Product ID: 328251470

Details

Brand
DAP
Item dimensions L x W x H
5.1 x 5.1 x
Item weight
10.1 Ounces
Material
HAWA
Style
Tube

💧100% waterproof seal

🛡️weather-resistant durability

🇺🇸Made in USA quality

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¥4967

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Description

🛠️ Seal smart, last long — concrete care that means business!

FLEXIBLE STRONG - Silicone-enhanced formula ensures superior adhesion and crack resistance.
SEAL WITH CONFIDENCE - Creates a fully waterproof, weatherproof barrier that stands up to the elements.
VERSATILE APPLICATION - Perfect for both interior and exterior concrete, mortar, and masonry repairs.
ECO CONSCIOUS LOW ODOR - VOC compliant and easy to clean with water, safe for your workspace.
TRUSTED AMERICAN CRAFTSMANSHIP - Proudly manufactured in the USA for consistent, high-quality performance.

DAP Latex Concrete Sealant is a durable, waterproof, and weather-resistant sealant designed for repairing cracks and holes in concrete, mortar, and masonry. Enhanced with silicone for improved flexibility and adhesion, it forms a paintable, gas and oil resistant barrier suitable for both indoor and outdoor use. Made in the USA, VOC compliant, and easy to apply with low odor, it delivers professional-grade results for lasting concrete protection.

Specifications

ASIN	B000H5S09G
Best Sellers Rank	#72,013 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #172 in Silicone Sealers
Brand Name	DAP
Color	Gray
Compatible Material	Concrete
Customer Reviews	4.7 4.7 out of 5 stars (3)
Global Trade Identification Number	00070798180215
Included Components	1 Tube
Item Dimensions	5.1 x 5.1 x 28.6 centimeters
Item Form	Paste
Item Type Name	concrete sealant
Item Weight	10.1 Ounces
Manufacturer	Dap
Material Type	HAWA
Model	7079818096
Number of Items	1
Part Number	7079818096
Style Name	Tube
Surface Recommendation	Exterior/Interior
UPC	070798180215
Unit Count	10.1 Ounce
Water Resistance Level	Waterproof

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¥4967

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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