Is this sandable once dry?

It is not. It is like a firm rubber once dry.

What seals rain/water best? This or any silicone caulking?

I have had better experience with the polyurethane caulk. It seems to adhere longer. I have used MasterSeal and had good luck with it. I have used the white and black.

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2 Pack MasterSeal NP1 White Polyurethane Caulk

Product ID: 466157993

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📏38x26.29x6.5cm

📦2-pack

⚖️286g weight

Description

🔧 Seal it, don’t regret it!

SEAL THE DEAL - Durable polyurethane formula for long-lasting protection.
WEATHER WARRIOR - Resistant to moisture and extreme temperatures.
DOUBLE THE VALUE - Two tubes for twice the sealing power.
PROFESSIONAL GRADE - Trusted by contractors and DIY enthusiasts alike.
PRECISION APPLICATION - Easy-to-use design for flawless finishes.

The MasterSeal NP1 White Polyurethane Caulk comes in a convenient 2-pack, offering a robust sealing solution for both professional and DIY projects. With a weight of 286 grams and dimensions of 38 x 26.29 x 6.5 cm, this high-performance caulk is designed to withstand moisture and extreme temperatures, ensuring a durable and reliable seal. Perfect for those who value quality and efficiency in their home improvement tasks.

Specifications

Brand	MasterSeal NP1
Manufacturer	BASF
Model number	NP1WHITE
Number of Memory Sticks	2
Item Weight	286 g
Package Dimensions	38 x 26.29 x 6.5 cm; 286.33 Grams
Item model number	NP1WHITE
Are batteries included?	No

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