I am new to welding and metalwork in general. Doing some work on trailer and wondering what's best to protect the exposed steel and weld bead? I have a few cans of cold galvanised spray which someone suggested but wondering if some of the proper mechanical folks in here have any advice?
Nodge68
Well-Known Member
Bonda Primer.
https://www.ebay.co.uk/itm/19364634...854063617_193646349889&targetid=1139674280107
This stuff applied to clean, freshly abraded steel is amazing. Literally the only way to remove it once cured is to grind it off.
Amazing stuff.
brianp38dse
Well-Known Member
+1 for the bonda primer i used it on my classic car after it was recommended by a friend, you can weld through it as well
flat
Well-Known Member
Abs
Absolutely second this. I also haven’t found a top coat that doesn’t stick to it either.
Expensive but it works *really* well.
also surprisingly hardy if you don’t bother top coating over it, last for years
Bonda Primer.
https://www.ebay.co.uk/itm/19364634...854063617_193646349889&targetid=1139674280107
This stuff applied to clean, freshly abraded steel is amazing. Literally the only way to remove it once cured is to grind it off.
Amazing stuff.
Absolutely second this. I also haven’t found a top coat that doesn’t stick to it either.
Expensive but it works *really* well.
also surprisingly hardy if you don’t bother top coating over it, last for years
Nodge68
Well-Known Member
Absolutely. I've actually used it bare for years in a Nissan chassis, and no rust came through. It is amazing stuff.
brianp38dse
Well-Known Member
Bonda primer seams to be one of those really good low volume products that fly's under radar and can contain all the good stuff that the mass produced ones have to omit due to health and safety
Brilliant stuff thanks. I have various needs, but the main current one is just protecting the weld from exposed environment. Yesterday I ground off rust ready to weld, the misses said dinner's ready so I ran to gobble my pie and veg which took about 20 minutes with a few drop of rain happening too. came back out to dry it off and weld and it was already brown coated with rust. It's a ****en nightmare for rust here, lose all our vehicles to rust. Transit had 100k miles and was scrapped as everything rotted out! So I just want something to apply as soon as weld is cooled down, then consider overcoating later but i often won't bother if it's not needed (in non visible areas). If I do want to overcoat it, any recommendations? Hammerite or somethin else?
thanks again, never heard of Bonda and definitely gonna try it
thanks again, never heard of Bonda and definitely gonna try it
Nodge68
Well-Known Member
I've used it for 30 years, it's my goto primer.
You can, and it slows the rust down.
You can't beat linishing off the rust first though, before painting with Bonda.
I've used it for 30 years, it's my goto primer.
You can, and it slows the rust down.
You can't beat linishing off the rust first though, before painting with Bonda.
Thanks, when you say finishing off the rust, do you mean mechanically, or chemically with something like Jenolite?
flat
Well-Known Member
you definitely want bonda primer then.
mots weird stuff, I am convinced it actually ‘penetrates’ into the metal if that makes sense? You will see what I mean when you paint it on.
flat
Well-Known Member
he means using a cup brush or flap disc to remove as much flakey cr@p active rust stuff as possible before painting if not going onto fresh/clean metal
Nodge68
Well-Known Member
Either mechanical or chemical, but not a rust converter, as that leaves a skin that Bonda doesn't like.
I found Bonda sticks best to a rough surface, but as long as it's free from oils or grease, it sticks very well indeed. I'm sure Bonda chemically bonds to the metal, so it's really permanent, which is just what is needed.
doriz
Well-Known Member
That gone rusty through lack of use?Sounds bloody fantastic! What I have been hoping for for years! Just got myself a pot, look forward to trying it. I will try it on my wife's sex toy drawer lock. (if only she had one
Well I got my bonda primer. Nobody told me it's the colour of Tango
Amazing stuff as many have said above. Bonds brilliantly. I hammered and scrubbed off all loose rust then painted on. boy it goes a long way too which is good at fifteen squid a tin! Can see me using a lot of this. I have a rusty hona quad which really needs some kind of protection, and I fancy cleaning underneath and using this on it too, orange top, orange bottom.
Only question is, i bought a tin off ebay and there's a VERY thick and heavy sludge/sediment in the bottom which doesn't want to stir in. Old stock maybe, anyone had that before?
Amazing stuff as many have said above. Bonds brilliantly. I hammered and scrubbed off all loose rust then painted on. boy it goes a long way too which is good at fifteen squid a tin! Can see me using a lot of this. I have a rusty hona quad which really needs some kind of protection, and I fancy cleaning underneath and using this on it too, orange top, orange bottom.
Only question is, i bought a tin off ebay and there's a VERY thick and heavy sludge/sediment in the bottom which doesn't want to stir in. Old stock maybe, anyone had that before?
Nodge68
Well-Known Member
You really need to get the stuff off the bottom, as that's the zinc, which does the protecting.
If the can sits for a while, the heavy zinc sinks to the bottom, which is why it's orange in colour, as it goes red when it's mixed properly.
It takes some mixing, to get the zinc back in suspension.
I use a paint stirrer, the type that goes in a power drill, as it's hard work otherwise.
