If you don't have topcoat for house painting, you have several alternatives depending on surface and desired finish, but topcoat is important for durability, washability, and appearance. For interior walls, if you don't have topcoat but have primer or undercoat, you can use undercoat alone temporarily, but it will be flat, less washable, and less durable, so it is not ideal as final finish and should be topcoated soon. Better alternatives include using self-priming paint that acts as both primer and topcoat, so if you have paint and primer in one, you can use two coats of that as topcoat. For wood trim or furniture, if you don't have paint topcoat, you can use varnish, polyurethane, or lacquer as protective topcoat over stain or paint. For cars, if you don't have automotive topcoat clear coat, you should not leave base coat exposed, as it will fade and peel, you can use temporary clear coat spray or wait to get proper 2K clear coat. For nails, if you don't have topcoat, you can use clear nail polish as topcoat. For crafts, you can use Mod Podge, clear acrylic sealer, or polyurethane as topcoat. So what you can use depends on project, but for house walls, use paint and primer in one or another paint as topcoat, not just primer alone long term, as primer is not designed to resist wear and washing.
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