Sanding Primer around Letters and Script of Fuel tank

The letters if there is any real damage to the paint it would be easier to strip the paint down to the bare metal before priming. Then you would just need to scuff it a little between coats. It wouldn't need a thorough sanding like an open area where you are trying to level the tin. If there is damage to the metal then that should be filled and shaped as you go. Paint doesn't hold up very well with the gas they make today. I would recommend using an epoxy primer and topcoat with urethane paint. It would work the best if all the paint was stripped on the gas tank and then coated with epoxy primer before any filler was used. Then because of the recoat window coat with epoxy primer, prime again after the filler was used.
 
to get to bare metal use a cup brush on a 4.5 in grinder,be sure to wear safety glasses.
 

I have found the need to sand into tight spaces numerous times in order to get the quality job that I want. I cut a piece of wwod to a size and shape that will go in there yet allow me to hold it, and then stick some self adhesive sand paper on it.
 
I keep an assortment of wire end brushes that have a 1/4" shank and use them with a cordless drill. Great for getting into tight places. The brushes are from 1/4 to 1" wide and some are brass, steel, and stainless steel. I also use drill bit extenders that accept the 1/4" shank and give me reach for hard to reach places i.e. behind a fuel injection pump. Good places to shop are Zoro and JBTools. Small wire wheel brushes that fit the same are also a big help.
 
If you're talking about sanding primer before paint: I'd go a far as possible with your chosen grit wet paper, then when near lettering, switch to red Scotchbrite pads. I think those are about like 320 paper and won't cut into the raised areas like paper. Flexible so the can be wrapper around anything that fits the area, paint stick, paper towel roll, finger etc.
 
3m and Norton both make different grit sanding sponges that work well around and in letters etc most automotive paint stores should have !
 
(quoted from post at 13:17:19 08/11/20) I like to do a better job of sanding in the details of the letters on my fuel tank. any ideas about how to do it ?
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Thats about 5 to 6 coats of sanding majic primer to fill in rust pitts plus Some possible old old paint Not much. ,I wet sanded down With 220 the primer and reshot primer to fill in pitts, use spot and glaze . But it doesnt look right around the lettering and script . I cant wet sand it to get the surfaces smooth.
I I got most of the tank wet sanded smooth and happy with the surfaces ,but if I coat it with Fordson gray paint and Paint the lettering red , the letting will show all the unsanded areas.
 
(quoted from post at 04:03:04 08/19/20) Thats about 5 to 6 coats of sanding majic primer to fill in rust pitts plus Some possible old old paint Not much. ,I wet sanded down With 220 the primer and reshot primer to fill in pitts, use spot and glaze . But it doesnt look right around the lettering and script . I cant wet sand it to get the surfaces smooth.
I I got most of the tank wet sanded smooth and happy with the surfaces ,but if I coat it with Fordson gray paint and Paint the lettering red , the letting will show all the unsanded areas.


It looks like either the raised letters are mostly worn away or you have filled in so much with paint that they are not raised any longer. If the situation is that the space between the letters is filled in with paint you need to sand it down by making a sanding block of the proper size. I have used the edge of a piece of 1/4 inch sheet plastic as a sanding block before.
 
I think someone has sanded the paint off a number of times over the years and in the process sanded the letters off too. You might chemically strip the paint off there and see if the letters are sanded off or it's just paint between. The letters could be put back on with bondo but it would be a very tedious time consuming job to do it.
 
I use a Campbell hausford sandblasted with 80 grit glass beads . This is what it got .
Sprayed with rust oleum automotive primer , I thin it lifted the based primer Coat ❓
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Look at transitions to lettering to primer base coats to letters . Think I can sand it out ?
 
Perhaps you should have sandblasted a bigger area. That would take a lot of hand sanding to make the transition. If more of it was sandblasted then the transition would be easier with an electric sander. Anyway it looks like you are solving the problem.
 

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