right now iam building a bf-109
and i painted the base coat of light blue.
and iam hand painting the dark green camo
so i used masking tape and when i took off the tape after the paint dryed some paint bleed ,
under on to the blue.
so do i fix this or should i use better masking tape thanks guys

Bleeding is a problem with masking tape, even if you think you've burnished it down well. What I do is apply the tape and secure the edge. I then take some clear gloss (future) and brush or spray it over the edges of my mask. This way, the clear bleeds under the tape and not the flowing colours.

Masking can be a problem especially if hand brushing. Mike has the right idea of clear coating after masking (you can also just apply the base color again so the color that bleeds is the same color as what is already there).

One thing I do is trim the masking tape first. Sometimes the adhesive doesn't go all the way to the edge of the tape. So I'll put it on a piece of glass first and trim the the edge off (about 2-3mm) so that I'm sure the adhesive is right up at the edge.

When brush painting ALWAYS paint with the brush starting on the masked and moving to the unmasked so you aren't pushing paint under the tape with the brush.

thanks for the help. i will try both things,
i hope it works