SOHC.co.uk Forums > CB750
Restoration of Sandcast Frame 5369/ Engine E5479
UK Pete:
As you can see from my previous post i am tackling the blasting and painting of my frame myself,this is for two reasons, number 1 is i just dont trust anyone to do it with the same care and attention that i will, and reason 2 is i usually powdercoat but this de values the sandcast , it is a big no no when you speak to any sandcast owner restorer, oh yes there is a third reason , i do not have the money to pay someone else
Yesterday i thought this would be a doddle probably an hour or two's work, how wrong could i be, my blaster just was not getting through the two layers of paint very quickly if atal in places, so i whipped out and got some paint stripper, quick word of advise do not ever by nitromores stripper, its expensive and totally shit, it just would not lift the paint, so i was out side till 11 last night trying to scrape off soft paint with a stanley blade and then go over it with a scotchbrite wheel on the drill, this got a good deal of it off so this morning i did more scraping , more blasting and more scotchwheeling and ended up with a shiney bare metal frame, all i can say is thank goodness that is over
now i have the problem of finding a doner frame and getting the seat hinges cut off and welded on to my frame as some mother f--er ground them off, as well as the side stand bracket which i have just done
now with all this moisture in the air at this time of year it would be stupid to leave it bare metal, so i have sprayed it up with some rust preventing primer till i get the seat bracket situation sorted, that way it wont start rusting in a hurry, i also wrapped it in a blanket then boxed it up and have stashed it
Take a look there is absolutely no rust on this frame, the very light surface rust that was there came clean off with the blaster, so them two layers of awkward paint done the job, other than the ground off brackets you could not wish for a better 45 year old frame
pete
[imghttp://cb750sandcastonly.com/coppermine/albums/userpics/10004/sandcast_008~2.JPG]http://[/img]
Trigger:
Did notice that your blasting gun is small Pete. That would take a good 12 hours to do. A good paint stripper is a wire brush on a angle grinder, had some good results by doing it that way.
were the original sand cast frames stove enamel?
UK Pete:
Trigger your right the gun is small really the whole set up is just too DIY, i eventually used the blaster to get to the awkward places and drill attachments to get the easy to get at parts, i got there in the end fella, as for original coating i have no idea, the thing is there was a coating on top of the original, and this had remained quite soft and so the sand just bounced off, i got to say i am well happy now that stage is over and done with
pete
RGP750:
Can't fault your determination Pete ,Brilliant.
Trigger:
I stripped a sand cast frame about 10 years ago and the front part was stove enamel but, the rest was a black paint over a orange/red lead base primer. I stove enameled the frame in the end because i could not find what it should be.
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