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.

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.

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

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

ASIN	B000GTIRAU
ASIN	B000GTIRAU
Age Range Description	Adult
Best Sellers Rank	#192,124 in Automotive ( See Top 100 in Automotive ) #32 in Primers
Brand Name	SEM
Color	Grey
Color Code	#808080
Container Type	Aerosol Can
Coverage	4.7-5.6 sq.m/liter
Customer Reviews	4.6 4.6 out of 5 stars (530)
Customer reviews	4.6 4.6 out of 5 stars (530)
Date First Available	10 August 2012
Dry Time In Hours	3
Finish Type	Matte
Full Cure Time	1 Hours
Global Trade Identification Number	00646786396830
Included Components	Aerosol Can
Indoor Outdoor Usage	Outdoor
Is Discontinued By Manufacturer	No
Is Waterproof	False
Item Form	Aerosol
Item Volume	65.66 Cubic Inches
Item Weight	454 g
Item model number	39683
Manufacturer	SEM
Manufacturer	SEM
Model Name	39683
Model Number	39683
Paint Type	Etching Primer
Part Number	39683
Product Dimensions	6.99 x 6.99 x 23.5 cm; 453.59 g
Size	15.5 Ounce (Pack of 1)
Special Features	Fast-Drying, Excellent Adhesion
Specific Uses For Product	automotive repair and refinishing, metal restoration projects, industrial coating applications
Surface Recommendation	Steel, Aluminum
UPC	646786396830
Unit Count	15.5 Fluid Ounces
Water Resistance Level	Water Resistant

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39683 Grey Self Etching Primer - 15.5 oz.

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