Question 1

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

Accepted Answer

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.

Question 2

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

Accepted Answer

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.

Question 3

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

Accepted Answer

All i can tel u that the image is sem

Question 4

Is this the same as zinc chromate primer?

Accepted Answer

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.

ASIN	B000GTIRAU
Age Range Description	Adult
Best Sellers Rank	#13,482 in Automotive ( See Top 100 in Automotive ) #10 in Automotive Primers
Brand	SEM
Brand Name	SEM
Color	Grey
Color Code	#808080
Container Type	Can
Coverage	Excellent
Customer Reviews	4.6 out of 5 stars 563 Reviews
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	1 Pounds
Manufacturer	SEM
Model Name	39683
Model Number	39683
Paint Type	Etching Primer
Part Number	39683
Size	15.5 Ounce (Pack of 1)
Special Feature	Fast-Drying, Excellent Adhesion
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
Water Resistance Level	Water Resistant

39683 Grey Self Etching Primer - 15.5 oz.

Details

Details

Description

Specifications

Common Questions