8 replies to this topic

[JonnyAlpha]

Ok so I laid on a second coat of epoxy primer (after some more minor filling) and let cure for 24 hours, then yesterday afternoon I flatted the primer down with P800, masked up and started the Top Coats.

In a hurry to get the painting done (very few days left before I have to get this finished) I started to late and the weather was against me (threatening to rain with a the odd light drizzle), not the best conditions for spraying (although still warm).

 

As a result I ended up finishing quite late and had to use a work lamp for the last coat. I think I laid on about 3 coats and as it was drying off it looked patchy but couldn't tell whether this was the lack of paint covering or just the paint drying?? Bad light did not help.

Anyway this morning it is looking quite patchy in places so sadly is going to need a couple more coats me thinks but now its dry I am not 100% sure of the process. Should I flat of the top coat with P800 wet again and then apply another couple of coats of cellulose?

Thanks for any advice.

 

[JonnyAlpha]

Mmm interesting, out of interest in one of the patchy areas (where I thought the paint was showing the primer underneath) I just rubbed it with a cotton cloth and the paint is darker underneath ?? So this is some kind of difference in the surface layer?

Update - having done some more reading this could be blooming caused by the moisture outside and the fact that it was not a hot sunny day? I used Anti Blooming Thinners. Can this be rectified without respraying?

 

Should I have a go at 1200 grit and rubbing compound?

 

If after this it does need another coat how do I remove the rubbing compound before respraying?

Edited by JonnyAlpha, 10 July 2016 - 03:55 PM.

[midridge2]

Celly can be overpainted in about less than 24 hours without flatting again.
If longer just scuff it over with a scotchbright.
If you do buff it up and need to paint again just wash off the paste and use a tack rag before painting.

[JonnyAlpha]

Celly can be overpainted in about less than 24 hours without flatting again.
If longer just scuff it over with a scotchbright.
If you do buff it up and need to paint again just wash off the paste and use a tack rag before painting.

Which scotch brite and what rubbing compound - never done this before?

[Daz1968]

I use grey scotchbrite pads,

[Stu.]

Three coats is about 3 - 4 coats shy of whats needed. To allow for adequate flatting back you need to lay down 6 -7 good coats.

 

If you've not worked with Celly before, you'll need to flat back the paint surface once it's fully dried and the solvents mostly evaoprated from the surface (after around 3 weeks).

 

Flatting back with wet and dry paper to remove orange peel and defeccts in the paint is needed. Once this is done it needs to be machine polished back up to get the shine with a good polishing compound.

 

When you flat back, you remove the top paint surfaces, so if you only have 3 layers you'll soon be rubbing through to the primer. This is especially easy to do on radius curves and corners, so the more paint layers you can lay on the better.

 

If I were you I'd put on about another three or four coats. Dont worry about overpainting celly, as previously said, it's essential that you provide a good key to the surface, but in any event the solvent of the new paint will melt a little into the existing new celly paint surface anyway due to the thinner content in the paint.

 

Don't worry, one of the benefits of celly is that it's easy to overpaint and touch up / blend in errors etc.

 

Hope this helps.

Edited by Stu., 10 July 2016 - 06:36 PM.

[JonnyAlpha]

Mmm; guessed as much, sad thing is I have very few days left before I have to go away on a long earnt 8 week break. I need a couple of nice days to get this cracked. One day prepping (flatting etc) and a whole day for spraying the remaining 4 coats. Plus another day for the roof once the body is cured.

[Dusky]

Why does it take you a day for 4 coats? You should spray a second coat when the previous coat is still sticky ( easy to feel on some masking paper.

[JonnyAlpha]

Why does it take you a day for 4 coats? You should spray a second coat when the previous coat is still sticky ( easy to feel on some masking paper.

 

I say a day because I am spraying outside under a large gazebo (tent) and need some nice weather and need to spray during the warmest part of the day between 10:00 and 15:00 I guess. So if I flat down the day before that means I only need to mask up and wipe down before I start spraying. The actual spraying should only take a couple of hours wet on wet.

 

I have just finished the roof, 7 coats wet on wet.