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.

3m Dynatron 358 1 Pack Of 3 Spreaders 4 5

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Sold byAmazon HungaryDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Spread like a pro, finish like a boss!

BUILT TO LAST - Durable construction designed for repeated industrial use, supporting your professional workflow without fail.
CLEAN READY ALWAYS - Non-absorbent surfaces ensure cured material pops off easily, keeping tools pristine and reusable.
EFFORTLESS PRECISION - Flexible edges allow for smooth, accurate spreading of fillers, caulks, and putties with minimal effort.
PERFECT FIT EVERY TIME - Three spreader sizes tailored for any filler job, maximizing efficiency and finish quality.
TRUSTED INDUSTRY STANDARD - Backed by 3M’s science-driven innovation, these spreaders elevate your auto body repair game.

The 3M Dynatron 3-Pack Spreaders include 4”, 5”, and 6” flexible-edge tools designed for professional auto body repair. Their non-absorbent surfaces allow cured filler to release cleanly, enabling fast reuse and maintaining tool cleanliness. Engineered for durability and precision, these spreaders streamline filler, glaze, and putty application, making them essential for efficient, high-quality collision repair.

Specifications

ASIN	B0015DMGD0
Best Sellers Rank	#8,404 in Automotive ( See Top 100 in Automotive ) #22 in Body Repair Putty #106 in Body Repair Tools
Customer Reviews	4.7 4.7 out of 5 stars (5,021)
Department	unisex-adult
Item Weight	2.82 ounces
Item model number	358
Manufacturer	3M
Product Dimensions	7 x 7 x 0.5 inches

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