Is this different than the 357 bondo spreader? they're both made by 3m and appear to be the same size...is one more flexible or any other difference?

This is a simple piece of hard plastic. Not flexible.

Is the back completely flat?

Yes, there is NO raised text on the backside. There is the hole that you can see in the picture. However mine are/came warped - curved longway. Good luck with your project!

Hello can I use this to fix Partial board kitchen cabinets? Thanks so much

Not fully understanding the question, if you can use the spreader to fix a cabinet, the spreader will add no value to strength or structure to a cabinet. The spreader is used to spread body filler and glazes on surfaces.

Can you use this for touching up shower grout?

These are flat on the bottom but grout typically is "indented" a bit. It would be easier to use your (wet) finger or the bottom of a spoon to press in the grout.

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Dynatron, 358, 1 Pack of 3 Spreaders, 4”, 5” and 6”, Used for Spreading of Fillers, Caulks, Glazes and Putties

Product ID: 256732089

🌀Flexible edges for smooth spreading

📏3 sizes (4”, 5”, 6”) for precision

🧴Non-absorbent surface for clean reuse

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Description

🔧 Spread like a pro — precision tools for flawless finishes!

CLEAN READY ALWAYS - Non-absorbent surface prevents material buildup, making cleanup quick and hassle-free.
EFFORTLESS APPLICATION - Flexible edges ensure smooth, accurate spreading that elevates your finish quality.
PERFECT FIT EVERY TIME - Three versatile spreader sizes tailored for any filler, caulk, glaze, or putty application.
DURABILITY MEETS EFFICIENCY - Reusable design with cured material popping off easily, maximizing tool lifespan and productivity.
TRUSTED PRO GRADE PERFORMANCE - Backed by 3M’s science-driven innovation, engineered for professional collision repair excellence.

The Dynatron 3-Pack Spreaders by 3M include 4”, 5”, and 6” flexible-edge tools designed for professional auto body repair. Their non-absorbent surfaces allow cured fillers to pop off easily, ensuring fast reuse and clean application. Engineered for durability and efficiency, these spreaders deliver precise, smooth spreading of fillers, caulks, glazes, and putties, making them essential for any collision repair professional.

Specifications

ASIN	B0015DMGD0
Best Sellers Rank	#77,717 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #93 in Caulk
Brand	3M
Customer Reviews	4.7 4.7 out of 5 stars (4,816)
Date First Available	7 August 2012
Item Weight	80 g
Item model number	358
Manufacturer	3M
Manufacturer Part Number	358
Model	358
OEM Part Number	358
Product Dimensions	17.78 x 17.78 x 1.27 cm; 80 g

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

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