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.

39683 Grey Self Etching Primer 15 5 Oz

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Description

⚡ Prime Fast, Finish Flawless – The Ultimate Metal Prep Powerhouse

CORROSION DEFENSE - Built-in protection to keep your metal surfaces pristine
PRO GRADE COVERAGE - 15.5 oz can covers a wide range of automotive and industrial projects
SPEED MEETS PRECISION - Dries fully in just 1 hour for rapid project turnaround
EFFORTLESS APPLICATION - Smooth, easy spray for a professional finish without the hassle
UNMATCHED METAL BONDING - Self-etching formula ensures flawless adhesion every time

The SEM 39683 Grey Self Etching Primer is a fast-drying, high-adhesion primer designed for bare metal surfaces. Offering excellent corrosion resistance and a smooth base for paint, this 15.5 oz can delivers professional-grade coverage ideal for automotive repair, metal restoration, and industrial coatings. Trusted by pros and DIYers alike, it ensures consistent, durable results with a quick 1-hour dry time.

Specifications

ASIN	B000GTIRAU
Age Range Description	Adult
Best Sellers Rank	#40,452 in Automotive ( See Top 100 in Automotive ) #37 in Automotive Primers
Brand Name	SEM
Color	Grey
Color Code	#808080
Container Type	Can
Customer Reviews	4.7 4.7 out of 5 stars (575)
Dry Time In Hours	3
Finish Type	Primer
Full Cure Time	1 hours
Global Trade Identification Number	00646786396830
Included Components	Item
Indoor Outdoor Usage	Outdoor
Is Waterproof	False
Item Form	Liquid
Item Volume	65.66 cubic inches
Item Weight	16 ounces
Manufacturer	SEM
Model Name	39683
Model Number	39683
Paint Type	Etching Primer
Part Number	39683
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	Variety
UPC	646786396830
Unit Count	15.5 Ounce
Warranty Description	Call vendor for warranty

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E£ 5837

Duties & taxes included

In stock

Sold byAmazon EGYPTDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to EGYPT.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Received my product in pristine condition. Great service overall.