Can these be painted?

It can be painted, you will need to use a paint suitable for vinyl material. The first time I tried I didn’t use the correct paint and it peeled off within a couple months.

Can this be mounted over an existing junction box?

This j block is meant for vinyl siding mount to what's behind the siding. The block is the electrical box

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WHITE UNIVERSAL J-BLOCK UNIBLOCK PW

Product ID: 478638321

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Details

Connector Type
Screw
Number Of Contacts
1
Mounting Type
Inside Mount
Material
vinyl
Color
White
Brand
Alcoa Home

📏8-3/16" x 8-3/16"

📦Single pack

🔄Adjusts 1/2" to 1-1/4"

Description

🔧 Elevate Your Projects with the Ultimate J-Block!

TRUSTED BRAND - Manufactured by Alcoa Home Exteriors, a name synonymous with quality.
ADJUSTABLE FIT - Easily adapts from 1/2" to 1-1/4" to meet your project needs.
LIGHTWEIGHT DESIGN - Weighing only 191 grams, it's easy to handle and install.
VERSATILE DIMENSIONS - Perfectly sized at 8-3/16" x 8-3/16" for seamless integration.
DURABLE VINYL MATERIAL - Crafted from high-quality vinyl for long-lasting performance.

The WHITE UNIVERSAL J-BLOCK UNIBLOCK PW is a versatile and durable vinyl component designed for seamless integration into your home improvement projects. With dimensions of 8-3/16" x 8-3/16" and an adjustable fit from 1/2" to 1-1/4", this lightweight product ensures ease of installation and reliability, backed by the trusted quality of Alcoa Home Exteriors.

Specifications

Manufacturer	Alcoa Home Exteriors
Part number	UNIBLOCK PW
Item Weight	191 g
Package Dimensions	27.51 x 24 x 5.79 cm; 191 Grams
Item model number	UNIBLOCK PW
Size	Pack of 1
Material	Vinyl
Item Package Quantity	1
Measurement System	Imperial
Plug profile	Surface
Batteries included?	No
Batteries Required?	No

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€ 161.08

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TrustScore 4.5 | 7,300+ reviews