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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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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$27.84

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Sold byAmazon EcuadorDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Spread smarter, not harder — the pro’s choice for flawless finishes!

BUILT TO LAST - Durable construction designed for repeated industrial use, supporting your high-demand collision repair workflow.
CLEAN READY ALWAYS - Non-absorbent surface prevents material buildup, making cleanup a breeze and tools ready for immediate reuse.
EFFORTLESS PRECISION - Flexible edges allow for smooth, accurate spreading of fillers, caulks, and putties—cutting down your prep time.
PERFECT FIT EVERY TIME - Three versatile spreader sizes tailored for any filler application, ensuring flawless coverage and efficiency.
TRUSTED INDUSTRY STANDARD - Backed by 3M’s science-driven innovation, these spreaders elevate your auto body repair game with proven reliability.

The 3M Dynatron 3-Pack Spreaders include 4”, 5”, and 6” flexible-edge tools designed for precise application of fillers, caulks, and putties in auto body repair. Featuring a non-absorbent, easy-clean surface, these reusable spreaders enhance efficiency and durability, making them an essential, science-backed solution for professional collision repair and maintenance.

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