An epoxy primer is what you want to use on bare or freshly sandblasted steel for your maximum adhesion and rust prevention. The urethane primer is what you want to use after your bodywork is done as a filler primer. Epoxy is simply a primer, whereas 2K urethane primers are considered a primer surfacer.
Can you spray urethane primer over epoxy primer?
bs35j, The answer to your question is “ yes ” you can spray urethane paint directly over the epoxy primer. In fact that method is preferable to spraying urethane over 2-K primer surfacer. Thats with the caveat that you spray the urethane over the epoxy within the epoxies recoat time window.
What is the purpose of urethane primer?
Urethane primer (2K) Urethane primer is the most common primer used in auto body and restoration by far. It has good solids and fills well. It is easy to sand and can provide you with a perfect body when blocked properly. Care should be taken when applying it as to not use too much.
Can you use urethane primer on bare metal?
Bare steel gets primed with urethanes all the time . Very few shops follow current OEM recomendations about using a epoxy on bare metal. I haven’t seen many adhesion issues though at the various shops I’ve worked at(with comebacks) over the years.
What is epoxy urethane primer?
410-48248 Epoxy Urethane Primer is a two component adhesion promoting epoxy urethane primer designed to be used over bare metal surfaces under polyester spray or hand applied body fillers and 2K primers, to protect against corrosion. ... It should be used whenever optimum corrosion protection is required.
Do you have to sand epoxy primer before top coat?
Thank you in advance! The re-coat window of epoxy primer only needs to be followed when you intend to apply another coating without sanding to from a chemical bond. If you scuff the epoxy you can apply another coating that will form a mechanical bond with the epoxy.
Can I put primer over epoxy?
A primer coat prior to painting over epoxy is quite beneficial because it provides a uniform color base and is easier to sand than epoxy resin. It is generally not necessary to use a primer in order for a suitable top coat to adhere to sanded epoxy resin.
Do you have to sand urethane primer?
Wet sanding 2K Urethane primer is best done with 400 to 600 grit wet/dry paper on a Durablock. Under most circumstances you will not need to DA sand over your work after wet sanding because wet sanding creates much finer scratches. ... You would sand the same way as 2K Urethane Primer—400 to 600 grit wet.
What is the difference between polyester primer and urethane primer?
While polyester primers are great for filling, they can be porous. Once you’re finished sanding the polyester primer, use a urethane primer or a sealer over it. Urethane primers are a better surface for basecoats. The urethane primer is much denser and seals the polyester surface.
How long does it take for urethane primer to dry?
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.
What primer Do you use on bare metal?
Epoxy primer works best on bare metal and is recommended for newly-fabricated metal parts or those that have been fully stripped. You can also apply primer surfacer or filler over epoxy primer to get rid of any minor imperfections and to create a flat surface before you paint.
Which is harder epoxy or urethane?
Overall, epoxy coatings offer a harder, more impact-resistant floor compared to urethane. Its bond with the concrete substrate, together with the thickness it is able to sustain, makes it hard to beat in durability. ... Epoxy has its limitations, too. This coating is sensitive to UV light.
What color is epoxy primer?
A primer makes the concrete ready for the next stage. Whereas, the ‘Indigo Paints’ epoxy primer is a sealer that binds the concrete with the paint. A primer is mostly white or neutral in colour .
What is a good epoxy primer?
- Custom Shop Black Epoxy Primer/Sealer KEP 406/KEP 402 : Best Overall.
- Speedokote Epoxy Fast Dry 2.1 : Quickest Drying.
- SprayMax 2K Activated Epoxy Primer : Best For Small Jobs.
- Raptor Anti-Corrosive Epoxy Primer : Best For Already Rusty Surfaces.
- Rust-Oleum Automotive 2-in-1 Filler And Sandable Primer : Best Budget Option.
Does epoxy paint need primer?
An epoxy primer is the foundation of your floor coating system. Without it, your epoxy system will not work as well no matter what type of epoxy you are applying. Epoxy primers are the layer that you will build upon with other base coats and topcoats.
