Mold Lines, pisssssssed...

Argh..

pissed.. i was removing the mold lines from my s2000, i thought i had them pretty well done, so i sprayed the first coat of primer. Ok so one of the lines was still pretty bad, sanded down, thought i got rid of it.. primed again, still there... sanded down again with coarser grit, thought i got rid of it.. primed, STILL THERE!!!!

think i should re do it? i think i'll have too much primer else where, especially glogging up the panel lines. maybe mask off the area when i respray? or maybe i'll try some putty first and then prime...

i'll post a pic later.

i got the same problem doing with my tamiya subaru wrc 99......one mold line on the rear left bumper still exists after tons of primer.........wasting 2 cans of it, but still exists WTF

Whut kind of grit of sand paper are u using? hey i got a question how do u put those little picutures under ur name the forum?

Originally posted by joecwlaw
i got the same problem doing with my tamiya subaru wrc 99......one mold line on the rear left bumper still exists after tons of primer.........wasting 2 cans of it, but still exists WTF

yeah sucks man..
i think i'll try sand it down and putty the area, mask off area and spray it again...

hopefully this time will be ok...

And you all say Revell are bad, at least their mold lines come out.

Try fileing (spelling?) them out, might work better.

Try using a file, instead of sand paper to reduce the gap. Then, coat the gap with superglue or putty, then sand it with 600, 1000 and 1500 grit.

Also, brush paint the primer (or Mr. Surfacer bottle) on the affected area to smooth the seam lines, instead of using a spray, or the primer will be too thick, and you'll lose the details.

http://files.automotiveforums.com/uploads/371868sw20uk25.jpg

http://files.automotiveforums.com/uploads/954597sw20uk15.jpg

thanks, I did not think of using the Mr. Surfacer bottle, I applied tamiya grey putty today and waiting it to dry.........I think I applied too much. Shit! I will try Mr. Surfacer bottle on my next project, it seems more precise.

You are probably spraying so much primer on the body that the mold lines are reappearing. You get them sanded smooth, apply primer, and they show up again. This happens because the thinner/reducer in the automotive primer is too strong, and when it gets down to the plastic it causes the plastic underneath to swell. This happens when you've sanded plastic down, any area that has been sanded has lost it's original glossy surface, which seems to be much more impervious to chemicals than areas that have been sanded. The plastic that's been sanded is much more porous. Lacquer paints by nature etch into themselves, so no matter what every new coat of lacquer has the chance that the thinners will leach down through every layer into the plastic.

You need to either spray the paint in thinner coats, letting them dry in between coats, or use a primer that doesn't etch the plastic. Tamiya primer works best. Some companies like Model Car World make airbrush primers and sealers that work to keep this from happening. If you are airbrushing, using enamel paints instead of lacquers will help...but I hate enamel clearcoats. I solved that problem by spraying enamel paintjobs with Gunze Mr. Topcote (501).

I've had this problem before using automotive paints...it's a royal pain in the ass. Even if I use automotive paint, I use Tamiya clear so that the mold lines don't reappear after all the work to remove them.

I agree with Jonno. Try filing the lines off. If you're sanding them off anyway, I'd try wrapping the paper around a block of wood or something, which gives a surface with less give than your fingers and much more aggressive sanding.:sun:

What part of the S2000, I got one on my work bench at the moment, just want to know ahead of time!

and zoom, thanks for posting, I enjoyed reading it!

i dunno but i sound like your putty isnt sticking to well to the plastic, which might explain why the seam keeps appearing even after youve sand it down. you should either use a CA glue(or SSP-HG if you got any) which sticks better to plastic, or thin down your putty with some liquid cement to give your putty some extra bite.