Eastwood Gray Urethane Automotive Primer and Activator
Get ready for the final coat on new parts or autobody repairs with this gray 2K primer and activator combination. High-build urethane primer is a versatile surfacer that can be applied over bare metal, body filler, epoxy primer, existing paint and much more. Since the primer is sandable and fills imperfections as you spray, it’s great if you want to get an older surface perfectly smooth. The activator promotes adhesion for the primer and also helps it dry faster so you can get to painting.
Our 2-component gray automotive primer kit is an ideal all-around solution if you’re repainting an entire restored vehicle or running a professional shop. It’s made in the USA with excellent color holdout at temperatures up to 150 degrees A gallon of primer mixes 4:1 with the activator to create five sprayable quarts, which covers 140 square feet — more than enough for the average car or small truck. Eastwood provides lifetime tech support by phone or email to help you Do the Job Right.
Eastwood 4:1 Gray Urethane Primer Features:
Mixes 4:1 with 50241ZP Activator
Fills well and builds quickly
Dries fast and easy to sand
Apply over epoxy primer, body filler, existing finishes
Approximate Coverage Per Gallon: 140 SQ FT
Maximum operating temperature: 150 Fahrenheit
Made in the USA
It fills well, sands easily and provides excellent color holdout for all top coats. Mixes 4:1 with 50241 ZP catalyst. May be applied over Eastwood Epoxy primers, old paint, & body fillers. Ideal for block sanding in 3-4 hrs after application. When primer is mixed 4:1 with activator it makes 5 spray-able quarts. Primer is VOC 4.8 lbs per gallon.
This product can not be shipped to California
If you're sanding primer or body filler you have to check out the Eastwood Elite Contour DSB Dustless Sanding Block System that gives you laser straight panels while keeping you and your shop clean because it eliminates 95% of the sanding dust.
Specifications
MIXING RATIO
After shaking/stirring primer, thoroughly mix four parts 2K Urethane Primer Sur - facer with one part Urethane Primer Activator
Option
To reduce film build, 4:1 mixture may be cut by up to 20% with a urethane-grade reducer. Doing this may also improve the flow and leveling of primer. Eastwood suggests using a Zero-VOC reducer to avoid potential compliance issues. Use caution in mixing materials as epoxy primer may begin to gel after approximately two hours (at 70 °F).
SPRAY GUN SETUP when used as a HIGH BUILD PRIMER SURFACER
HVLP Gun
Fluid Tip 1.5-1.7 mm Spray Pressure 8-10 psi at Air Cap (25-30 psi at regulator before gun)
Conventional Gravity
Fluid Tip 1.6-2.0 mm Spray Pressure 40-50 psi
Conventional Siphon
Fluid Tip: 1.7-2.0 mm Spray Pressure 40-50 psi
SPRAY GUN SETUP when used as a WET-ON-WET PRIMER SEALER
HVLP Gun
Fluid Tip 1.2-1.4 mm Spray Pressure 8-10 psi at Air Cap (25-30 psi at regulator before gun)
Conventional Gravity
Fluid Tip 1.4-1.6 mm Spray Pressure 40-50 psi
Conventional Siphon
Fluid Tip: 1.5-1.6 mm Spray Pressure 40-50 psi
APPLICATION INSTRUCTIONS
Eastwood 2K Urethane Primer Surfacer should be applied in two medium wet coats, with a 10-15 minute flash period between each (at 70 °F). Typically, two coats is enough to achieve the desired 2 mil. dry film thickness, though more material may be applied as needed.
Urethane Primer Surfacer may be topcoated after approximately 30 minutes, or up to 18 hours (at 70 °F with sufficient cross-ventilation), with no additional prep required. After 18 hour recoat window, primer MUST be sanded prior to topcoat application for adhesion purposes.
May be wet sanded after 2-3 hours, or block sanded (dry) after 3-4 hours.
Rated 5 out of
5 by
Jack from
Filler primerGood primer works well, after spraying I just had to do some fine sanding then clean then ready to paint
Date published: 2024-11-22
Rated 5 out of
5 by
Clinton from
Great primerGreat primer, built really well and covered great. Used in conjunction with epoxy primer after body work. Sprayed nicely out of a 1.7 tip. This is my first vehicle to paint so hope it lasts.
Date published: 2024-11-06
Rated 5 out of
5 by
DES57 from
4K Primer for sanding abilityAs a one time only vehicle painter, I used this 2K primer, after I discovered epoxy primer clogs up sand paper. Now I’m able to body fill and block sand with ease.
Date published: 2024-11-05
Rated 5 out of
5 by
Anonymous from
Best primer all aroundVery good primer dries nice sands good don’t clog up paper fills nice
Date published: 2024-02-14
Rated 5 out of
5 by
Matt from
2K gray primerMy first time painting and the 2K primer worked great for my first job.
Date published: 2023-11-22
Rated 5 out of
5 by
Michael See from
Drys Fast, Great BuildPurchased the product over a week ago. Fast shipping and executed properly. Rough finish but can be sanded. 4:1 has much more sprayable material than advertised.
Yes, the Eastwood Gray 4:1 Urethane Primer and Activator can adhere to plastic surfaces, but it is recommended to use an adhesion promoter first. This ensures proper adhesion of the primer to the plastic surface, allowing you to block sand it straight and achieve the desired finish
Answered by: Greg A Tech Advisor
Date published: 2025-03-27
What grit would you recommend I sand your epoxy primer before i apply your 2K urethane high build
Asked by: tampa
Before applying 2K Urethane Primer over epoxy primer, the surface should be sanded with 320-400 grit sandpaper. This grit range ensures proper adhesion of the 2K Urethane Primer to the epoxy primer without causing excessive scratches or damage to the surface.
Answered by: Bill G Tech Advisor
Date published: 2025-03-03
What do you use to clean the spray equipment?
Asked by: BBB1
Keep your painting equipment performing like the day that you bought it with Eastwood Paint Gun and Paint Equipment Cleaner.item# 16155zp. Have you ever had paint kick too quick and ruin a paint gun? Does you current paint gun have left over residue from previous paint jobs all over it? Revive all of your painting equipment with Eastwood's Paint Gun and Equipment Cleaner. Simply submerge, spray or wipe your equipment to a like new performance level.
Answered by: Wil Tech Support
Date published: 2025-02-25
The description for this 2K primer says it can be sprayed on bare metal, but some responses say not to use on bare metal. Can you please clarify if I can us on bare metal? Thanks
Asked by: Alfred
Yes it is designed for bare metal. Get ready for the final coat on new parts or autobody repairs with this gray 2K primer and activator combination. High-build urethane primer is a versatile surfacer that can be applied over bare metal, body filler, epoxy primer, existing paint and much more. Since the primer is sandable and fills imperfections as you spray, it’s great if you want to get an older surface perfectly smooth. The activator promotes adhesion for the primer and also helps it dry faster so you can get to painting.
Answered by: Wil Tech Support
Date published: 2025-02-20
Will this cover pinholes in the filler?
Asked by: Shiparino
Coating and blocking with this primer would ultimately fill pinholes. It may be best to use a glaze-coat filler to fill the pinholes first. Also best to not have pinholes in the filler. Stirring improperly introduces air and causes this.
Answered by: Bill G Tech Advisor
Date published: 2025-02-19
Is 2k Urethane primer ok to use on bare aluminum?
Asked by: bbrotz
It is reccommended to use Eastwood Gray Epoxy Primer and Catalyst - for Automotive Car Paint - 2 Gallon Kit on bare metal, item # 50244ZP and #50245ZP for the Catalyst. This primer is excellent on steel, aluminum, fiberglass, body fillers and even existing finishes.
Answered by: James Project Advisor
Date published: 2023-12-01
Can I use this if I'm going to be doing base coat clear coat?
Asked by: Walter
Yes, this Urethane primer can absolutely be used with our 4:1 Basecoat paints.
Answered by: Kelly H
Date published: 2023-11-29
Can body filler or your contour filler be applied over the Urethane 2K primer? I have primed the whole car with one coat of your Urethane 2K primer which sprayed perfectly. I now see some defects that will need to work.
Asked by: Peahead
As long as the surface is prepped correctly. Scuff with Scotch Guard Pad (RE) pre paint prep o clean surface completely before re-spraying
