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How Do I Repair Holes in Grille after Blasting

R

RTR

Well-known Member
What would be the best, most cost effective way to repair holes such as this. They were caused by sandblasting the peice.
13935.jpg
 
They were not caused by sandblasting the piece , they were caused by rusting through and the blasting just cleaned it out to good metal. Depending on your skills , you can use brazing rod and torch and braze it full or you can use a wire welder and turn on low and wire weld it up. either way you shouldn't need filler after if you are carefull with your finish grinding. There's no rust left so no need to cut out anything before welding.
The easy no-skill way out would be to fill with JB Weld. Your choice.
 
(quoted from post at 06:24:08 01/20/13) They were not caused by sandblasting the piece , they were caused by rusting through and the blasting just cleaned it out to good metal. Depending on your skills , you can use brazing rod and torch and braze it full or you can use a wire welder and turn on low and wire weld it up. either way you shouldn't need filler after if you are carefull with your finish grinding. There's no rust left so no need to cut out anything before welding.
The easy no-skill way out would be to fill with JB Weld. Your choice.
Click to expand...

Good and bad news.

Uncle is a pipeline welder and grandfather is an iron worker welder. Both with about 100 years combined experience. Bad news is that we only have stick welders. Small ones big ones gas and diesel machines. I don't think it could be welded with those machines. Looks like its gonna be JB Weld. How would the JB stay in the holes without squeezing through. Should I put something behind it?
 
If it were me I would fill the hole from the back side with bondo. I would put a thin layer on and while wet push a sheet of fiberglass cloth into the bondo followed by a thicker layer of bondo. Having the sheet of fiberglass cloth inbedded in the bondo will keep it from falling out.

It looks like you need to use a different media or turn the pressure down. That's a lot of damage.
 

A professional sandblasting and powder coating place did these peices for me. Everything else came out ok. I think there was a small pin hole in the gas tank but other than that ok.
 
Duct tape or masking tape over the holes, then JB Weld on the backside. Might want to leave your tape a little loose over the holes to allow your JB Weld to come through a little bit. Then sand smoothe when dry.
 
Well I didn't see what it looked like before but I'm seeing texture in the grille that I assume wasn't there before the sand blasting. If this is the case a professional should have stopped before doing all of it. I've damaged things with my little home model sand blaster before and quickly adjusted the pressure down before doing any more damage. I've also worked for a company that did some sand blasting on the side of aircraft parts. They used a plastic media to keep from damaging the metal.
 

Thanks so much for all of the tips guys. The texture is from the primer I primed the pieces with. It's all primer
 
You can stitch weld in a patch with a stick welder. It is easier with a piece of copper clamped behind the hole but can be done without the copper.
 
Bmaniac is correct. Rust through from water collecting in the corner.
You had better block sand that pimer down to smooth with some 220 grit wet or dry. And practice some more before you spray paint. You need to learn how to adjust pressure, and material. Try another coat of primer after sanding that down. It should flow out almost like paint.
 
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