What is urethane primer used for?
Urethane primers are used to promote the bonding and adhesion of urethanes to surfaces. Most urethanes should be applied over a prepared primed surface for optimal results.
What is the difference between urethane primer and polyester 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.
Can urethane primer be used 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.
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.
Is urethane primer water resistant?
Will rain effect primer? 2K high fill primer is not waterproof or even water resistant. It is porous like a sponge and will absorb moisture, causing the the metal to rust underneath.
Does urethane paint need primer?
Since urethane is only a primer surfacer, you’ll also need to apply a sealer before you paint. Again, a coat of epoxy primer over the top will serve the purpose. Filler primer paints are basically formulated to fill in any pits in the surface from sanding or rust even quicker than an epoxy primer alone.
What is the difference between self etching primer and epoxy primer?
Self etching primer bonds well to bare metal surfaces and can be top coated in a short period of time. Epoxy primer can be applied in heavy coats which can be guide coated and block sanded to remove small imperfections in the body. Epoxy primer takes longer to dry (cure) before it can be sanded or top coated.
Is 2K urethane primer waterproof?
2K high fill primer is not waterproof or even water resistant. It is porous like a sponge and will absorb moisture, causing the the metal to rust underneath.
Can you wet 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.
Is primer waterproof?
Primer is not waterproof. No paint is waterproof. All paint has an element of pourosity to it. If left enough then the surface of the primer will break down quicker as it’s not got a reflective coating.
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.