How much epoxy primer will I need?

T

Thomas Luba

Hello guys,
I'm new to this forum and have no experience painting with modern products as I haven't painted a car in over 30 years. I just got my car back from being dipped here locally in Wisconsin. It is a 63 Falcon Sprint restomod. I have it on a rotisserie and am preparing for SPI epoxy primer. First off I want to prime everything including inside the Rockers, frame rails, cowl, dash, hood and deck lid bracing. I'm planning on using an under seal gun from KBS Coatings with a long wand to get in those difficult places. I imagine there will be plenty of wasted epoxy primer. I'm old and work slowly so inevitably the epoxy will be past it's 7-Day window before recoating.

My tentative plan is as follows.
Spot treat with Ospho any flash rusted areas
While still wet wash thoroughly with water and a green Scotch-Brite.
Sand everything accessible with 80 grit, and apply 2-coats? epoxy to the entire car.
Sand w/80 grit, rough fill w/Rage Ultra, repeat as needed.
Block w/80 grit, apply Featherfill G2, repeat as needed.
Block w/180 grit, 2-coats epoxy over filled areas.
Block w/220 - 320 grit, 2-coats epoxy over exterior.
Block w/320 - 400 grit, 2-coats epoxy over exterior.
Block w/400 grit, scuff or sand floors and undercarriage?, 1-coat gray epoxy as sealer over entire car.
Wet sand w/400-600 grit, spray 2 basecoats.
If needed spot sand w/800-1500& 710 w&g remover, prep w/710,spray an additional basecoat.
Prep w/710, spray w/SPI Universal Clear 4-5 coats?.
Wet sand starting with 400-600 grit working up to 3000 or higher.

Questions:
1) How many coats of epoxy primer are needed for a sufficient mil thickness?


2) How many gallons epoxy primer will I need for the initial application to the entire car including doors, fenders, hood and deck lid?

3) Is scuffing with a Scotch-Brite okay on the floors and undercarriage before sealing with epoxy primer?

4) Would it be unwise to follow up with Dawn dish detergent and water after rinsing the Ospho?

Please comment on the proposed process as laid out.
 
Last edited by a moderator:
My tentative plan is as follows.
Spot treat with Ospho any flash rusted areas
While still wet wash thoroughly with water and a green Scotch-Brite.
Sand everything accessible with 80 grit, and apply 2-coats? epoxy to the entire car.
[2 coats is sufficient.]

Sand w/80 grit, rough fill w/Rage Ultra, repeat as needed.
[If you are within the 7 day window sanding isn't necessary for applying filler to SPI epoxy.]

Block w/80 grit, apply Featherfill G2, repeat as needed.
[Applying a couple of coats of poly primer and then block sanding should be sufficient.]
Block w/180 grit, 2-coats epoxy over filled areas.
[Personally I would switch to SPI 2k primer at this point but you are fine using straight epoxy if you choose.]
Block w/220 - 320 grit, 2-coats epoxy over exterior.
Block w/320 - 400 grit, 2-coats epoxy over exterior.

Block w/400 grit, scuff or sand floors and undercarriage?, 1-coat gray epoxy as sealer over entire car.
Wet sand w/400-600 grit, spray 2 basecoats.
[I would block with 600 and shoot at least 3 coats of base, more if it is a lighter color.]

If needed spot sand w/800-1500& 710 w&g remover, prep w/710,spray an additional basecoat.
Prep w/710, spray w/SPI Universal Clear 4-5 coats?.
Wet sand starting with 400-600 grit working up to 3000 or higher.
[Should be able to start with 1000 or even 1500. If you are looking to do a flow coat, sand with 400-600 and then shoot more clear.]

Others may have different methods and suggestions. Hopefully they will chime in.
 
Thanks Oldtimer,
What are your thoughts about question #2
How many gallons epoxy primer will I need for the initial application to the entire car including doors, fenders, hood and deck lid?
TL
 
Cheaper just to get a gallon kit as equals 2 gallons, will that be enough? Hard to say but as you use it if you see you need more, get it but don't over load yourself getting more at this point.
 
That's a fairly small vehicle so as Barry said, I would start with one gallon. The epoxy mixes 1:1 and will spray very well through a 1.4 tip adjusted like you would shoot a base coat.
Applying too heavy can cause fisheyes so get your gun dialed in.

I have a 1968 Plymouth GTX that I have sprayed the K-frame, control arms, brake calipers, underside and top of hood and the body shell (no doors or trunk lid) and still have a little bit of epoxy left. Of course there is a fresh gallon sitting in the cabinet waiting. ;)
 
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