Did something stupid - Ripples in XD Gloss

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Hi,

I did something stupid today, i started to give the first gloss coat of paint a light sand with 400 grit before it was fully dry. The result is that I have a small area of my desktop which has some ripples and another spot or two where there are tiny tears which have slightly bubbled with paint.

The question is, what is the best way to recover the situation. This is a small, but noticeable part of the desk and I want to get it right. More then happy to sand back, fill if necessary and apply two more coats of gloss. My main concern is how long to leave the paint to dry now? It seems the bubbles have paint in them (I put a needle to one and it was filled with paint. I am hoping that the paint will still dry in the next few days?)

Any advice welcome....ridicule also humbly accepted :(
 
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Have you addressed the dust particles ? Tiny Tears - that's a doll ;)or are you shedding them. I googled XD gloss yesterday and from what you say now it seems like a "normal" solvent based gloss, which I am not sure will be suitable for a desktop:( It'll take days to harden.
 
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Have you addressed the dust particles ? Tiny Tears - that's a doll ;)or are you shedding them. I googled XD gloss yesterday and from what you say now it seems like a "normal" solvent based gloss, which I am not sure will be suitable for a desktop:( It'll take days to harden.

The first step of removing the dust particles was to do a light sand on the surface....FAIL!

Am I right in saying that even though some of the paint is under the skin of the paint it will eventually dry if left long enough. Then I can sand back and start again?
 
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So I was just taking a look at the paint today - a different section which I thought had no problems - and I accidently dropped something fairly light (iphone) onto the surface. The paint immediately tore and it was apparent that paint was still wet between the undercoat and the top skin.

The paint normally needs 24hrs for recoat and it has had more than 48hrs now!

The question now is, what do I do? I am committed to sanding back already but I want to make sure that the next coats of paint work properly as this is the second time I have had an issue. Whilst this is maybe not the best paint for inside, and I am open to other ideas on surface finish, I cant believe that a paint suitable for front doors is normally so delicate. In fact on my first attempt with this paint, after 24hrs I had no problem sanding the paint down and it was definately fully dry.

Questions:
- What could be causing this issue? Maybe the undercoat was not quite dry - it had been left for 24hrs as per the instructions - Sikkens Oil Undercoat. Too many coats in quick succession?
- How do I sand this back if the paint is still wet and shows no sign of drying? Will it eventually, I am not convinced.
- What other options of paint would you recommend - Ideally I want a high sheen red that is relatively tough and durable?

Environmental Factors:
- The room is dry, heated, well ventilated and there is no moisture or condensation issues (i.e. plaster is old and dry as is the paint)
- The desktop is fitted so I cannot remove it to take it to get sprayed by a pro
- I do not have any pro sparying equiptment. I could tape everything up to spray paint the surface but it would be a bit of a hassle
- Process used on the surface so far:
0. MDF Cut & Shaped
1. Sanded 80 grit then 120 grit
2. Clean Clean Clean
3. Sikkens Rubbol Primer Plus 24hrs to dry
4. 120 grit then 240 grit
5. Clean Clean Clean
6. Sikkens Rubbol Primer Plus 24hrs to dry
7. 240 grit w&d then 400 grit w&d
8. Clean Clean Clean
8. Rubbol XD Gloss - 24hrs to dry
9. 400 grit w&d
10. Clean Clean Clean
11. Rubbol XD Gloss - 24hrs to dry (realised I had loads of dirt marks)
12. 120 grit nearly down to undercoat (just visible)
13. Sikkens Rubbol Primer Plus 24hrs to dry
14. 240 grit w&d then 400 grit w&d
15. Clean Clean Clean
16. Rubbol XD Gloss - 24hrs to dry (realised I had loads of dirt marks)
17. Started 400 grit w&d and had issues of tearing
 
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Another idea as to why this went wront - on the first attempt I used a roller, this time I used a pure bristle brush and it seems like the coat was slightly thicker than with the roller.
 
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you could leave it for six months and see if it hardens. If it does it may wrinkle (see "crackle paint" or "crocodiling")

Or scrape it off now.

You can't sand it until you have removed all the gel, or it has hardened.
 
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you could leave it for six months and see if it hardens. If it does it may wrinkle (see "crackle paint" or "crocodiling")

Or scrape it off now.

You can't sand it until you have removed all the gel, or it has hardened.

I am scraping the stuff up - it seems to come up nice and easy (some of the undercoat is coming up too). In terms of next steps I think I need to:
1. Finish the scraping
2. Clean the surface to remove oily parts (with meths)
3. Leave the surface to dry (1 week)
4. Sand
5. Clean
6. Undercoat
7. Sand & Clean
8. Top Coat 1
9. Sand & Clean
10. Top Coat 2

Does that make sense?
 
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if the "oily parts" are tacky paint, use thinners (presumably white spirit)

then leave it a while in fresh air to harden before sanding.

Perhaps you should thin your paint and undercoat before redoing, so you can apply two thin coats instead of one thick.
 
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if the "oily parts" are tacky paint, use thinners (presumably white spirit)

then leave it a while in fresh air to harden before sanding.

Perhaps you should thin your paint and undercoat before redoing, so you can apply two thin coats instead of one thick.
I will definately undercoat - XD Gloss specifically says not to thin it. I have ordered some specialist rollers as it is easier to get a thin coat with a roller. Alternatively I will just ensure that I use a much thinner coat.

If you have experience thinning Sikkens XD Gloss, I would be interested in knowing what proportions you used.
 
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