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

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

Product ID: 256732089

📏3 sizes (4”, 5”, 6”) for precision

♻️Non-absorbent, reusable surface

🛠️Flexible edges for smooth spreading

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Description

🛠️ Master the art of flawless finishes with 3M Dynatron Spreaders – your secret to pro-level precision!

CLEAN READY - Non-absorbent surfaces prevent material buildup, making cleanup fast and keeping tools ready for immediate reuse.
EFFORTLESS PRECISION - Flexible edges deliver smooth, accurate spreading of fillers, caulks, glazes, and putties with minimal effort.
PERFECT FIT EVERY TIME - Three versatile spreader sizes ensure you always have the right tool for flawless filler application.
DURABILITY MEETS EFFICIENCY - Engineered for long-lasting performance, these spreaders withstand repeated use in demanding professional environments.
TRUSTED SCIENCE BACKED BRAND - From 3M’s Dynatron line, designed specifically for high-quality auto body repair and maintenance.

The 3M Dynatron 358 3-pack spreaders (4”, 5”, and 6”) are professional-grade tools designed for efficient and precise application of fillers, caulks, glazes, and putties. Featuring flexible edges and a non-absorbent surface, these spreaders ensure smooth spreading, easy cleaning, and long-lasting durability, making them essential for collision repair and auto body professionals.

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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