mikewint
Captain
As above, a number of different questions arise and most were asked aboveand answered.
My $.02: For putty to crack it sounds as though you had a large gap to fill. Mayhap a bit more of dry fitting and sanding of the bare plastic could/might narrow the gap to be filled. Next,: Putty fill does not have to be sanded. After filling use a Q-tip dipped in nail polish remover (like Cutex) and rub it across the fill. Don't use a lot of of Cutex and don't let the Q-tip get clogged with putty. Basically putty is really thick paint so use more Q-tips as needed to smooth the fill. Remember nail polish remover is essentially Acetone with will affect the plastic of the model if you use too much. Once smooth allow time for the Cutex to evaporate then perhaps a bit of fine (1200 grit) finish sanding if necessary. There is a tutorial in the modeling section for more detailed instructions.
Rustoleum and such commercial paints are really not formulated for plastic models, stick to MODEL-paints either enamels or acrylics. Rattle can MODEL-lacquers like Tamiya's also work very well as the harsh solvents actually "eat" into the plastics and thus help anchor the paint to the plastic.
Lastly I tend to disagree about Tamiya's masking tape. It Has a very high Tack (stickyness). It is excellent for bare plastic but I've always found that it tends to remove paint as well when removed. You need a LOW tack masking tape for painted areas. If you want to use commercial-type painting-type masking tapes look for tapes marked GENTLE or go to an actual Paint Store and ask. House painter's tape is rated by how many days it can be left up without leaving residue on the surface being masked. It is available in 1-, 3-, 7-, 14-, 30-, and 60-day ratings, with the 7- and 14-day tapes being the most common. The longer-rated tapes are typically less adhesive, and are sold for use on smooth, delicate surfaces such as vinyl wallpaper and recently painted walls.
An alternative to Masking-type tapes is DRAFTING TAPE, it looks similar to ordinary household masking tape, but has a lower tack. It is intended to hold blueprints to a drawing board or light table, and to pull off easily without damaging the drawing.
My $.02: For putty to crack it sounds as though you had a large gap to fill. Mayhap a bit more of dry fitting and sanding of the bare plastic could/might narrow the gap to be filled. Next,: Putty fill does not have to be sanded. After filling use a Q-tip dipped in nail polish remover (like Cutex) and rub it across the fill. Don't use a lot of of Cutex and don't let the Q-tip get clogged with putty. Basically putty is really thick paint so use more Q-tips as needed to smooth the fill. Remember nail polish remover is essentially Acetone with will affect the plastic of the model if you use too much. Once smooth allow time for the Cutex to evaporate then perhaps a bit of fine (1200 grit) finish sanding if necessary. There is a tutorial in the modeling section for more detailed instructions.
Rustoleum and such commercial paints are really not formulated for plastic models, stick to MODEL-paints either enamels or acrylics. Rattle can MODEL-lacquers like Tamiya's also work very well as the harsh solvents actually "eat" into the plastics and thus help anchor the paint to the plastic.
Lastly I tend to disagree about Tamiya's masking tape. It Has a very high Tack (stickyness). It is excellent for bare plastic but I've always found that it tends to remove paint as well when removed. You need a LOW tack masking tape for painted areas. If you want to use commercial-type painting-type masking tapes look for tapes marked GENTLE or go to an actual Paint Store and ask. House painter's tape is rated by how many days it can be left up without leaving residue on the surface being masked. It is available in 1-, 3-, 7-, 14-, 30-, and 60-day ratings, with the 7- and 14-day tapes being the most common. The longer-rated tapes are typically less adhesive, and are sold for use on smooth, delicate surfaces such as vinyl wallpaper and recently painted walls.
An alternative to Masking-type tapes is DRAFTING TAPE, it looks similar to ordinary household masking tape, but has a lower tack. It is intended to hold blueprints to a drawing board or light table, and to pull off easily without damaging the drawing.