E-coating/Rustproofing/Priming

[stuart]

7 minutes ago, dave bailey said:

Hi. There's some really good information going on here. I'm trying to sort out how I'm going to tackle the job in the near future.

I'm currently rebuilding my TR5 bodyshell after major surgery, involving cutting in half and removing quite a few panels that were distorted and/or rusted, ( including the boot floor and side panels which were in aluminium (anyone got a use for these panels?).

So most of the paint/sealants and general gunk have been removed in the process, but I'd still like to have the tub blasted anyway to give myself a consistent  surface finish.

This then brings me to what to do next. So my scheme at the moment is as follows.

1) Complete repair/rebuild of tub.

2) Have the tub blasted. (I don't want to use chemical stripping.)

3)Then:- Choice A. Coat in Two pack epoxy primer.

                                 Use filler / lead loading wherever necessary.

                                  Coat in Bondaprimer.

                Choice B. Coat in Bondaprimer.

                                  Use filler/ lead loading wherever necessary.

                                  Coat in Two pack epoxy primer.

(Or don't use Bondaprimer at all.)

There seems to be various options about post blasting treatment and I would appreciate any thoughts on my scheme, or any other ideas.

Dave.

Dave Ive already answered this on another thread somewhere. I would do option B as then it doesnt matter how long you take doing repairs as it will all be coated in Bondarust so it wont go rusty, its easy enough to then just grind that off round the edges of where you are welding as welding near Bondarust wont compromise it, it just goes brown. Etch primer has no such property and is moisture porous.

You can overcoat Bondarust with absolutely anything, just key with 180 grit and away you go. Its what Ive been doing for the last 30 yrs.

Stuart.

[stuart]

3 minutes ago, dave bailey said:

Hi. Thanks for the reply, (sorry, seem to have posted the post again, don't know why!)

Anyway, I agree Stuart, that option B is favorite, although I've heard that two pack epoxy primer should be applied directly to bare metal, just wondering how it would fare on top of Bondaprimer (a product I have never used)

Dave.

This is how I do it.

Stuart.

 

[dave bailey]

Thanks Stuart, I'll do it your way.

Dave.

[roy53]

Hi Dave

i have just had my tub sand/fine grit blasted [ no chemicals ] and all came back fine. They would not use bondaprimer but had their own. So the choice is collect un primed or their one to protect.

No distortion so pleased with the outcome .

Was scared off chemicals due to leaching problems later which i have seen. Soda leaves a residue that primer dose not like

Roy

Edited March 7, 2025 by roy53

[stuart]

19 hours ago, roy53 said:

Hi Dave

i have just had my tub sand/fine grit blasted [ no chemicals ] and all came back fine. They would not use bondaprimer but had their own. So the choice is collect un primed or their one to protect.

No distortion so pleased with the outcome .

Was scared off chemicals due to leaching problems later which i have seen. Soda leaves a residue that primer dose not like

Roy

I always supply blasters with Bondaprime and they are happy to use, never had one refuse yet.

Stuart.

[roy53]

This one is for Stuart

when do you seam seal ?

after bondaprimer or after 2k primer.

on the underside i assume before stonechip.

Cannot locate upol epoxy3 at this moment ?

 

Roy

[dave bailey]

2 hours ago, roy53 said:

This one is for Stuart

when do you seam seal ?

after bondaprimer or after 2k primer.

on the underside i assume before stonechip.

Cannot locate upol epoxy3 at this moment ?

 

Roy

Hi, yes I'd be interested in that answer too.

Dave.

[stuart]

Bondarust all over first so it goes into all the seams etc then seam seal everything, I prefer to brush it on so you can get it right into the seams and then smooth it out. Then stone chip then 2k primer then top coat.

Stuart.

 

[Malbaby]

A couple of products I use that are available in the UK.

"Restofinish" polyprimer is a two component Polyester resin-based Sealer Surfacer Primer....Available in different colours to suit your choice of top coat.

"Rage" gold as a general filler.

[roy53]

Stewart i have bonda primed the tub etc and have found it to have a rough texture a bit like sand paper. Easy to remove with a light sanding but wondered if normal ?

Don't remember this from previous use but that was years ago.

Roy

[stuart]

2 hours ago, roy53 said:

Stewart i have bonda primed the tub etc and have found it to have a rough texture a bit like sand paper. Easy to remove with a light sanding but wondered if normal ?

Don't remember this from previous use but that was years ago.

Roy

Depends on how you sprayed it Roy.  I thin with about 10% cellulose thinners and give it a couple of coats with plenty of flash off time between. I would just give yours a quick light nib with 180 grit and then 2k prime.

Stuart.

[roy53]

That maybe the answer as I used about 40% cellulose thinners to get a better spray pattern 

spent over a day with the 180 but a nice result for the next stage 

Roy