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

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🖤 Prime Like a Pro – The Ultimate Metal Prep Powerhouse

ECO SMART CHOICE - VOC compliant formula that meets environmental standards without compromising performance.
COMPACT LIGHTWEIGHT - Easy to handle 590g aerosol can, ideal for professional and DIY use alike.
PRECISION SELF ETCHING - Creates a perfect base layer that ensures long-lasting paint durability and finish.
UNIVERSAL METAL BONDING - Engineered for unbeatable adhesion on steel, aluminum, copper, and stainless steel.
FAST TRACK YOUR PROJECTS - Dries rapidly to keep your workflow seamless and efficient.

SEM Paints Self-Etching Black Primer Aerosol (Model 39673) is a quick-drying, VOC compliant primer designed for superior adhesion on multiple metal surfaces including steel, aluminum, copper, and stainless steel. Its self-etching formula ensures a durable base coat, making it an essential first step for professional-grade paint jobs.

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Manufacturer	SEM
Brand	SEM
Model	39673
Product Dimensions	15.24 x 5.08 x 5.08 cm; 589.67 g
Item model number	39673
Exterior	Aluminium,Copper,Stainless Steel,Steel
Manufacturer part number	39673
Special Features	Excellent Adhesion, Quick Drying
Item Weight	590 g

SEM Paints Self-Etching Black Primer Aerosol

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