Help Needed With Primed Part! [Pics]

[haloboyvash]

I'm new to this sort of stuff and am needing some help. I primed some pieces with a spray can primer and some of the pieces turned out really smooth, then there is some parts that are really bad messed up like in these pics here.

I was wondering what I could possibly do to prevent this, or how do I go about fixing it.

I tried some sanding and it helped on some pieces to an extent. I mostly dry sanded with 600 grit paper.

But like the piece I have shown in the picture.... I don't think sanding will save it so is there some way to strip all the primer off and start fresh? Like using some kind of chemical bath to strip it off but leave my bare plastic part?

 

[who45]

i just sanded and primed a part i had made, took me 4.5 hours - sanded it, primed it to highlight the areas to sort, fill them with a body filler , re sand and sand again with a 200-800 grit then a 1200 to get it smooth, re primed........repeated the process until it was to my liking.

your issue looks like a poor cast imo (unless it supposed to have the holes), you will have to fill , sand and keep repeating the process imo - the primer will certainly show any surface flaws in a cast - you could try a filler primer but it will build the layer thickness up more and if you need the part to fit into another object then the extra layers of paint will make it too tight.

hard graft required which means rub down, fill, rub down, fill and so on - or get a better cast/machined part

 

[BTTFSpencer]

It could have been the surface was not clean, and you have the fish-eye effect in the primer. I would go ahead and strip the primer, clean it and start it again. Unless they are just surface flaws, in that case fill all of the dots, maybe try a filler primer over it...and clean it up.

 

[haloboyvash]

What would you recommend to use to strip the primer, any chemical bath or what?

The cast was fine, I cleaned the piece in warm dish soap water and took a tooth brush to it and let it dry for a day.

It's just some how the primer sprayed funny onto this piece, my other pieces are smooth as can be.

But again what would be the best way to remove that primer?

 

[haloboyvash]

I was reading an article and someone suggested putting the piece into pinesol and letting it soak, it would help remove the primer.. Anyone got any ideas? The primer is on a plastic/resin piece.

 

[who45]

i use vim to remove any oil residue from resin, with a toothbrush under the tap and let to dry naturally, never had a fish eye issue after primer

 

[BTTFSpencer]

I use brake fluid to strip paint from my model's. Might wanna google that its ok to use on Resin, sorry for the late reply.

 

[G17RDY]

It looks like a rough cast to me, the primer has just shown up the pitting and holes in the part.

Best way forward for me, would to get some model filler, leaving the primer as is, and fill in all of the bumps and pitting, sand, prime again and repeat process until you are happy with the finish.

If you want to strip the paint, i recently used Graffiti Remover (Available in the UK, not sure about US version), brushed the liquid on and 15 mins later scrubbed off with a toothbrush. Safe for plastics and resin.
There is another product that a lot of people use in the US with a good deal of success, the name escapes me at the moment, its an automotive product i think, made by castrol????

 

[GF]

Looks like a bad casting to me aswell, you can clearly see all the pin holes and pitting, it's impossible the primer did that unless the primer was so strong it attacked the plastic which I doubt very much. It happens often especially with soem resin color which you don't see any defect until you
spray them with primer.

Remember primer is not only for paint to bond but grey colored to makes defects stand out so you can see were to touch up. The only solution is to putty and sand, I use bondo and while half dry use varsol to wipe off access, less sanding afterwads.

GFollano

 

[haloboyvash]

The piece in the picture I had already puttied and fixed all the holes and it was smooth all over. I primered the piece and it came out smooth on one side and fish eyed on the other. Then I tried to dry sand and wet sand it, that's what it looked like after I wet sanded it.

I honestly don't think it was the casting, but it very well may be. I think I may have not cleaned the piece thoroughly enough. I plan on stripping it with some chemicals and try it again.

Also thank you guys for the input and the info., I tried my luck at micromarks.com and purchased some Easy Lift-Off Paint and Decal Remover, hopefully that will do the trick

 

[AbsoluteSciFi]

Let us know what happens!

 

[haloboyvash]

Sure will, just gotta wait for my chemicals to arrive

BTW if it means anything I'm using filler primer and most of parts turned out perfect, it's just that certain spots on some pieces that seem to get that bubble fish eye effect. I let my pieces soak in a warm bath of dish washing liquid and water, then scrubbed with a soft bristle tooth brush. I just really think I may have not had them clean enough.

 

[Ray22]

What about nail polish remover?

 

[haloboyvash]

Have not tried that, gonna give that Easy Lift-Off Paint and Decal Remover a go and see what happens

 

[Jumpergal]

Acetone - nail polish remover - will soften almost anything. I had to clean primer from a figure and I used cotton balls and Qtips to get into the small spots, then toothpicks and used toothbrushes to clean the stuff out of imperfections. Old toothbrushes are generally soft enough by the time they've been used and discarded that they don't score the resin.

 

[haloboyvash]

Will def. have to give that a try next time

 

[division 6]

Stripping kits