For buyers, treating them as interchangeable can lead to the wrong RFQ. The primer is selected around adhesion and corrosion protection; the topcoat is selected around the final service and appearance requirements.
An epoxy anti-rust primer is typically specified as the first protective layer over prepared steel. The buyer should confirm substrate condition, surface preparation, corrosion environment, dry-film thickness target and the intended intermediate or topcoat.
Aliphatic acrylic polyurethane topcoats are generally chosen when the final finish needs stronger outdoor appearance retention and weathering performance than an epoxy finish alone. Color, gloss, UV exposure and maintenance expectations belong in the RFQ.
A practical industrial RFQ should explain how the primer, intermediate coat and topcoat are expected to work together. The supplier then has enough context to discuss a system rather than quote a single can of paint.
Carbon steel, galvanized steel or other substrate; preparation standard if specified by the project.
Indoor, outdoor, marine atmosphere, chemical area, immersion, high temperature or other service condition.
Primer, intermediate and topcoat requirements, including target dry-film thickness where defined.
Color, gloss, appearance retention and maintenance interval expectations.
RONVORA offers epoxy anti-rust primer and aliphatic acrylic polyurethane topcoat options within its protective-coating portfolio. Final system selection and technical values should be confirmed against the project specification and approved TDS.