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Q: Why does SEM not recommend applying color directly to this primer?

This is an etching primer. I, used it on Magnesium after etching with Borax and baking soda mixed. After drying I, used this prime 4 light coats over 4 days 1200 wet sand paper. I, then coated with primer for the paint ! 3 coats wet sad 3 coats of final coat rubbed out with fine polishing compound.I, did this project in Nov 19. So far so good.

Q: What type of paint can be applied on top of the primer? any paint? sprays? water based? oil based? are there any restrictions?

I would recommend staying with the same brand of paint for both primer and top coat. Although the SEM primer seems to work well with most top coats, I had a bad experience using it with a Rustoleum top coat. After priming bare aluminum with the SEM self-etch and letting it cure overnight, I applied a Rustoleum top coat. Within a few hours both the primer and the top coat pealed off. I spoke with the the SEM and the Rustoleum technical folks but neither knew exactly what caused this. Both, however, recommended sticking with the same brand for primer and top coat. I would recommend doing some test sprays, letting the primer cure the recommended length of time before applying the top coat. Note that the SEM self-etch is acetone based, and this might cause a problem with topcoats that use other bases, especially if the SEM has not been cured long enough.

Q: I have stripped aluminum bare. self etching primer, then primer, then top coat? are all these these paints made by sem?

All i can tel u that the image is sem

Q: Is this the same as zinc chromate primer?

I do not have the can anymore. So I cannot read the ingredients. However I do not think it contains zinc chromate...which is used for marine and auto applications. This stuff works great for bonding to bare aluminum parts that will need to be painted. Hope this helps.

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Description

🛠️ Elevate your metalwork with the primer pros trust — fast, flawless, and fiercely reliable!

OPTIMAL COVERAGE - Covers up to 5.6 sq.m per liter, maximizing your project’s efficiency and minimizing waste.
SPEED MEETS EFFICIENCY - Fast-drying aerosol spray designed to accelerate your refinishing projects without compromising quality.
PRECISION METAL BONDING - Self-etching primer that locks onto steel, aluminum, and stainless steel for unmatched durability.
VERSATILE COMPATIBILITY - Seamlessly works under primer surfacers and most paint systems for flawless layering.
PROFESSIONAL GRADE FINISH - Matte grey finish that provides a sleek, smooth base for automotive and industrial coatings.

The SEM 39683 Grey Self Etching Primer is a 15.5 oz aerosol designed for superior adhesion on steel, aluminum, and stainless steel surfaces. Fast-drying and compatible with most paint systems, it offers a matte grey finish ideal for automotive refinishing, metal restoration, and industrial applications. With coverage up to 5.6 sq.m per liter, it ensures efficient, professional-grade results every time.

Specifications

Manufacturer	SEM
Part number	39683
Item Weight	454 g
Product Dimensions	6.99 x 6.99 x 23.5 cm; 453.59 g
Item model number	39683
Size	15.5 Ounce (Pack of 1)
Color	Grey
Finish	Matte
Item thickness	9.25 Inches
Item Package Quantity	1
Coverage	4.7-5.6 sq.m/liter
Special Features	Fast-Drying, Excellent Adhesion
Specific uses	automotive repair and refinishing, metal restoration projects, industrial coating applications
Included components	Aerosol Can
Batteries Included?	No
Batteries Required?	No

Have a Question? See What Others Asked

Why does SEM not recommend applying color directly to this primer?

What type of paint can be applied on top of the primer? any paint? sprays? water based? oil based? are there any restrictions?

I have stripped aluminum bare. self etching primer, then primer, then top coat? are all these these paints made by sem?

Is this the same as zinc chromate primer?

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