Filler Adhesion

[dntbolt64]

I'm using Rage Ultra filler on a restoration (sandblasted, SPI epoxied, then filler) and after blocking with 80 grit and then 180, I needed another coat of filler and without really thinking I went ahead a spread another skim coat over the 180 sanded area. Does the 180 provide enough tooth for the filler or did I just screw up? Thanks for your help.

 

[elwood]

Yes

 

[dntbolt64]

So no need to sand it off and start over?

 

[AAE]

So no need to sand it off and start over?

You're good to go.

 

[elwood]

180 is ok to put more filler over.
I apologise for not elaborating more in my answer.

 

[dntbolt64]

Thanks for the quick response. When I get to glazing pinholes, is it ok to finish sand the filler with 220 grit then spread Dolphin Glaze over that?

 

[sprint_9]

Thanks for the quick response. When I get to glazing pinholes, is it ok to finish sand the filler with 220 grit then spread Dolphin Glaze over that?

You should stick with 180 or courser according to the tds.

https://www.u-pol.com/files/29229/up0714-TDS-EN

 

[dntbolt64]

Thanks for posting that link. I was looking at an old TDS sheet from '12 that didn't call out the specs for prepping body filler.

 

[elwood]

Barry has mentioned putting his epoxy over 180 filler in some of our conversations.

 

[MikeS]

Thanks for the quick response. When I get to glazing pinholes, is it ok to finish sand the filler with 220 grit then spread Dolphin Glaze over that?

I use Dolphin Glaze and have had on occasion discovered a pinhole here or there in the filler after final sanding with a finer grit and blowing it off with air (the sanding dust fills holes until is is blown off). Though the TDS mentions 180 or courser, I don't think that is necessary for filling a pinhole. Most of the glaze around the hole will sand off leaving only the pinholes filled.