Rust repairs

[re-tyred]

Looks like someone has put non stainless bolts in there. Also used screws instead of bolts with nuts. Get rid of them they will fail on you. If you can't undo them drill them out, get new bung inserts and start again with 316 stainless. Sikaflex around the new ones before screwing them into the hull. Tefgel the threads of the new stainless steel bolts.
This is a very important job. You don't want them to fail and they will be adding to other corrosion on the hull.

[Pdiddy24]

Thanks re-tyred. I'll get onto this asap
That's a bit annoying to hear that it could've been avoided with proper attention to it originally. Appreciate the advice. Glad I checked rather than leave it a few more months
Hopefully it won't quicken up the worsening of any other areas of the hull as you say

[Brett]

Looks like someone has put non stainless bolts in there. Also used screws instead of bolts with nuts. Get rid of them they will fail on you. If you can't undo them drill them out, get new bung inserts and start again with 316 stainless. Sikaflex around the new ones before screwing them into the hull. Tefgel the threads of the new stainless steel bolts.
This is a very important job. You don't want them to fail and they will be adding to other corrosion on the hull.

It's the rivet inserts that are rusting, replacethe rivets with stainless nuts and bolts and coat the bolts in duralac Buy here

Make sure to clean the area where the rust is thoroughly to remove the stain and make sure there are no steel flakes etc there, as it will just rust again if there are.

[Nude up]

If you do use duralac wear gloves it is a chromate and is absorbed through your skin that said it is one of the best things to stop dissimilar metal corrosion widely used in the aviation industry. Ps I use it a lot on my boat an example the zinc trim tab anode and stainless bolt assemble with duralac remove in 5 years no issue.

The yellow is chromate the green does not contain chromate we use both at work but everyone uses gloves read the sds.

[hornet]

If you do use duralac wear gloves it is a chromate and is absorbed through your skin that said it is one of the best things to stop dissimilar metal corrosion widely used in the aviation industry. Ps I use it a lot on my boat an example the zinc trim tab anode and stainless bolt assemble with duralac remove in 5 years no issue.

The yellow is chromate the green does not contain chromate we use both at work but everyone uses gloves read the sds.

Caution Nudie I wouldn't cote the anodes with anything...anodes are suppose to decay... if they don't decay your engine is corroding internally, I'm in the outboard trade.

[Nude up]

If you do use duralac wear gloves it is a chromate and is absorbed through your skin that said it is one of the best things to stop dissimilar metal corrosion widely used in the aviation industry. Ps I use it a lot on my boat an example the zinc trim tab anode and stainless bolt assemble with duralac remove in 5 years no issue.

The yellow is chromate the green does not contain chromate we use both at work but everyone uses gloves read the sds.

Caution Nudie I wouldn't cote the anodes with anything...anodes are suppose to decay... if they don't decay your engine is corroding internally, I'm in the outboard trade.

Only the thread of the bolt is coated it’s like tooth paste only the thread of the anode is in contact with the paste

[Pdiddy24]

It's important that only bolts with nuts are used and not revits?

[Pdiddy24]

If you do use duralac wear gloves it is a chromate and is absorbed through your skin that said it is one of the best things to stop dissimilar metal corrosion widely used in the aviation industry. Ps I use it a lot on my boat an example the zinc trim tab anode and stainless bolt assemble with duralac remove in 5 years no issue.

The yellow is chromate the green does not contain chromate we use both at work but everyone uses gloves read the sds.

Thanks Nude Up!

[hornet]

If you do use duralac wear gloves it is a chromate and is absorbed through your skin that said it is one of the best things to stop dissimilar metal corrosion widely used in the aviation industry. Ps I use it a lot on my boat an example the zinc trim tab anode and stainless bolt assemble with duralac remove in 5 years no issue.

The yellow is chromate the green does not contain chromate we use both at work but everyone uses gloves read the sds.

Caution Nudie I wouldn't cote the anodes with anything...anodes are suppose to decay... if they don't decay your engine is corroding internally, I'm in the outboard trade.

Only the thread of the bolt is coated it’s like tooth paste only the thread of the anode is in contact with the paste

It is still a contact point for the anode to do it's job, nothing the anode comes in contact with should be coated that restricts transfer, that includes bolts that hold them in place,if anything some engine oil so they thread in smoothly but will not interfere with metal to metal contact.

[Pdiddy24]

Probably going to get someone to look at this. Have been quoted under $500 to drill out everything, address any rusting that might be spreading, weld up area and holes and replace bungs.