When your home experiences flood damage, it can wreak havoc on the plaster walls and ceilings. One common problem that arises is the appearance of bulges and blisters in the plaster. Not only are these unsightly, but if left unattended, they can lead to further structural issues. Fortunately, there are steps you can take to fix these imperfections and achieve a seamless finish in your flood-damaged space.

Firstly, make sure the affected area is completely dry before starting any repair work. Use fans or dehumidifiers to remove any moisture from the surrounding environment. Once dry, thoroughly clean the damaged surface by removing loose debris with a brush or vacuum cleaner.

Next, prepare the area by gently scraping away any loose or crumbled plaster around the bulge or blister using a putty knife or scraper. Be careful not to cause more damage while doing this step.

To repair small-sized blisters or areas with minimal damage (less than 6 inches), use lightweight joint compound as a fill-in material. Apply an even coat over the affected spot using a putty knife, feathering outwards gradually for smooth blending into existing surfaces. Allow it to dry fully before sanding lightly with fine-grit sandpaper until flush with surrounding areas.

For larger bulges caused by extensive water exposure, it may be necessary to remove all damaged sections of plaster entirely. This job requires professional skills for precise execution; consider hiring experienced flood damage repair specialists who specialize in such tasks.

Once repaired or removed successfully, proceed with skim coating-the process of applying multiple thin layers of joint compound over large areas-to ensure an aesthetically pleasing result across your entire wall or ceiling surface.

Before applying joint compound for skim coating purposes ensure proper preparation - prime previously patched spots/sand glossy paint finishes/remove dust etc.- following manufacturer's instructions. Apply the compound in thin, even layers using a trowel or drywall knife. Feather out each layer slightly beyond the previous to achieve a seamless blend.

Sand lightly after each coat has dried thoroughly (allowing 24 hours drying time between coats) until achieving a smooth finish akin to your existing wall or ceiling surface. Remember that this step may require multiple coats and additional sanding for optimal results.

Once the final skim coat is complete, prime the surface with a high-quality sealer/primer before applying paint or wallpaper for added protection and to achieve desired aesthetics.

In summary, fixing plaster bulges and blisters caused by flood damage requires careful preparation and adept repair techniques. If you're unsure about tackling these repairs yourself, it's best to consult experienced professionals who specialize in flood damage repair - their expertise can save you time, effort, and ensure long-lasting results for your home. Don't let unsightly bulges and blisters linger; take action today for a seamlessly repaired space once again!