Right on the webpage for the product: Specifications MIXING RATIO After shaking/stirring primer, thoroughly mix one part primer with one part catalyst. No induction time is required with this epoxy system. SPRAY GUN SETUP HVLP Gun: Fluid Tip 1.4-1.8 mm Inlet Spray Pressure 25-30 psi Conventional Gravity: Fluid Tip 1.4-1.6 mm Inlet Spray Pressure 45-55 psi Conventional Siphon: Fluid Tip: 1.6-1.8 mm Inlet Spray Pressure 45-55 psi APPLICATION INSTRUCTIONS Eastwood Epoxy Primer should be applied in medium wet coats, with a 30-minute flash period between each (at 70 °F). Typically, one to two coats is enough to achieve the desired 1 mil. dry film thickness, though more material may be applied as needed. Additional build requires longer flash periods between coats. Epoxy primer may be topcoated after approximately 30 minutes (wait 45-60 minutes after applying more than two coats), or up to about five days. After five days, primer MUST be scuff sanded prior to topcoat application. May be sanded (wet) the day after application. Wait two to three days before sanding dry. 50 State Compliant Low VOC Formula

This is the regular version to be mixed and sprayed. You can find roll-on options on Eastwood.com. Search for Eastwood's Opti-Flow system.

Yes, Eastwood Hotrod Black Urethane can be applied over the Eastwood White Epoxy Primer and Catalyst without issues. The epoxy primer provides an excellent base for the urethane paint, ensuring good adhesion and compatibility. Additionally, the Hotrod Black Urethane is known for its good coverage, so you should not encounter any problems with achieving a uniform finish

After mixed the Eastwood White Epoxy Primer and Catalyst for Automotive Car Paint has an pot life of approximately 2 hours when mixed with meduim activator and a temperature of 70 degrees F. Results may vary.

I believe you mean a HVLP Gun: Fluid Tip 1.4-1.8 mm Inlet Spray Pressure 25-30 psi

Approximate Coverage Per Gallon: 140 SQ FT

No, you have up to 5 days to topcoat without the need to scuff or sand

This is not temp rated high enough to be used on an engine. The best option for use on an engine would be this primer here: https://www.eastwood.com/2k-aerospray-high-temp-engine-primer-gray.html