Is this compatible with a urethane basecoat and clearcoat?

Self etch primer is for bare metal. You should seal it first with a top coat of sealer primer before basecoat. I have put basecoat directly on it with no problems though.

Will this stick to plastic ?

I would probably use SEM Flexible Primer Surfacer on plastic.

Should this product be used on bumpers before spraying with SEM black trim paint?

I'm not an expert but I use this product on bare "not chrome" metal. If you're talking about a chrome bumper I'm just not sure if this product would actually "etch" it. That's an interesting question though. I think you should call SEM or Eastwood products and ask. Eastwood has a lot of products and experience with coating different materials. Check their website out. I'm interested to hear what worked for you so please let me know.

why is the 2 pack more expensive than 2 single cans combined?

I bought 2 and 4 packs cheaper Just have to search

Sem 39673 Black Self Etching Primer 15 5 Oz

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

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Sold byAmazon IsraelDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🖤 Prime like a pro, finish like a boss.

RAPID DRYING POWER - Get back to work in just 30 minutes—no downtime, no delays.
UNMATCHED ADHESION - Self-etching formula ensures your paint sticks like a pro—no peeling, no flaking.
MATTE BLACK ELEGANCE - A sleek, professional finish that preps your metal surfaces with style.
STAIN RESISTANT SHIELD - Keeps your primer looking flawless, resisting stains and imperfections.
VERSATILE OUTDOOR READY - Engineered for tough outdoor conditions—durable and water resistant for lasting results.

SEM 39673 Black Self Etching Primer is a fast-drying, matte black enamel primer designed for superior adhesion on bare metal surfaces. With a quick 30-minute dry time and stain-resistant properties, it delivers a durable, professional-grade base coat ideal for automotive and industrial applications.

Specifications

ASIN	B000PKZ3IY
ASIN	B000PKZ3IY
Age Range Description	Adult
Best Sellers Rank	#68,207 in Automotive ( See Top 100 in Automotive ) #16 in Primers
Brand Name	SEM
Color	Black
Color Code	#000000
Container Type	Can
Coverage	12-15 sq ft/15.5 oz
Customer Reviews	4.6 4.6 out of 5 stars (502)
Customer reviews	4.6 4.6 out of 5 stars (502)
Date First Available	6 February 2013
Dry Time In Hours	0.5
Finish Type	Matte
Full Cure Time	1 Hours
Global Trade Identification Number	00646786396731
Included Components	Aerosol
Indoor Outdoor Usage	Outdoor
Is Discontinued By Manufacturer	No
Is Waterproof	False
Item Form	Liquid
Item Volume	65.66 Cubic Inches
Item Weight	590 g
Item model number	39673
Manufacturer	SEM
Manufacturer	SEM
Model Name	39673
Model Number	39673
Paint Type	Enamel
Part Number	39673
Product Dimensions	15.24 x 5.08 x 5.08 cm; 589.67 g
Size	15.5 Ounce (Pack of 1)
Special Features	Stain Resistant
Specific Uses For Product	Automotive, Industrial
Surface Recommendation	Metal
UPC	646786396731
Unit Count	15.5 Grams
Water Resistance Level	Water Resistant

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